IEC 61951-2:2017
(Main)Secondary cells and batteries containing alkaline or other non acid electrolytes - Secondary sealed cells and batteries for portable applications - Part 2: Nickel-metal hydride
Secondary cells and batteries containing alkaline or other non acid electrolytes - Secondary sealed cells and batteries for portable applications - Part 2: Nickel-metal hydride
IEC 61951-2:2017 specifies marking, designation, dimensions, tests and requirements for secondary sealed nickel-metal hydride small prismatic, cylindrical and button cells and batteries, suitable for use in any orientation, for portable applications.
This edition includes the following significant technical changes with respect to the previous edition:
- addition of battery type;
- addition of ‘F’ (high recovery type) designation for cells and batteries;
- addition of ‘I’ (low self-discharge type) designation for cells;
- revision of Figure 3 (6.1.3.1);
- addition of “optional pip” note to positive contact;
- changed leader line position from pip to flats of positive contact (B and G).
Accumulateurs alcalins et autres accumulateurs à électrolyte non-acide - Accumulateurs étanches pour applications portables - Partie 2: Nickel-métal hydrure
L'IEC 61951-2:2017 spécifie le marquage, la désignation, les dimensions, les essais et les exigences applicables aux éléments et batteries d’accumulateurs parallélépipédiques, cylindriques et boutons, étanches, au nickel-métal hydrure, pouvant être utilisés dans toutes les orientations, pour applications portables.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
- ajout du type de batterie;
- ajout de la désignation ‘F’ (type à récupération élevée) pour les éléments et batteries;
- ajout de la désignation ‘I’ (type à autodécharge faible) pour les éléments;
- révision de la Figure 3 (6.1.3.1);
- ajout de la note "picot facultatif" au contact positif;
- modification de la position de la ligne de repère du picot aux surfaces planes du contact positif (B et G).
General Information
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Standards Content (Sample)
IEC 61951-2 ®
Edition 4.0 2017-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Portable sealed rechargeable single cells Secondary sealed cells
and batteries for portable applications –
Part 2: Nickel-metal hydride
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IEC 61951-2 ®
Edition 4.0 2017-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Portable sealed rechargeable single cells Secondary sealed cells
and batteries for portable applications –
Part 2: Nickel-metal hydride
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.220.30 ISBN 978-2-8322-4140-0
– 2 – IEC 61951-2:2017 RLV © IEC 2017
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Parameter measurement tolerances . 9
5 Cell and battery designation and marking . 10
5.1 Cell and battery designation . 10
5.1.1 Small prismatic cells and cylindrical cells . 10
5.1.2 Button cells. 11
5.1.3 Batteries . 12
5.2 Cell or battery termination . 12
5.3 Marking . 12
5.3.1 Small prismatic cells and cylindrical cells . 12
5.3.2 Button cells. 13
5.3.3 Batteries . 13
5.4 Exemption of wording. 13
6 Dimensions. 13
6.1 Small prismatic cells and cylindrical cells . 13
6.1.1 General . 13
6.1.2 Small prismatic cells . 14
6.1.3 Cylindrical cells . 14
6.2 Button cells . 16
6.3 9 V type nickel-metal hydride batteries . 17
7 Electrical tests . 18
7.1 General . 18
7.2 Charging procedure for test purposes . 18
7.2.1 Charging procedure for cell. 18
7.2.2 Charging procedure for battery . 18
7.3 Discharge performance . 18
7.3.1 General . 18
7.3.2 Discharge performance at 20 °C . 19
7.3.3 Discharge performance at 0 °C . 20
7.3.4 Discharge performance for rapid charge cells (R cells) . 21
7.4 Charge (capacity) retention . 21
7.5 Endurance . 22
7.5.1 Endurance in cycles. 22
7.5.2 Permanent charge endurance . 25
7.6 Charge acceptance at constant voltage . 29
7.7 Overcharge . 29
7.7.1 Small prismatic, L, M, H, X, LS or MS cylindrical, and button cells . 29
7.7.2 LT/LU, MT/MU or HT/HU cylindrical cells . 30
7.7.3 J cylindrical cells . 30
7.7.4 JT cylindrical cells . 30
7.7.5 R cylindrical cells . 31
7.8 Safety device operation . 31
7.9 Surface temperature limitation device operation (for S cell only) . 31
7.10 Storage . 32
7.10.1 Button cells or batteries, small prismatic cells or batteries, cylindrical
cells or batteries . 32
7.10.2 Button cells or batteries, small prismatic cells or batteries, cylindrical
cells or batteries (high recovery type) . 33
7.11 Charge acceptance at +55 °C for LT, MT or HT cylindrical cells . 34
7.12 Trickle charge acceptance for JT cylindrical cells . 35
7.13 Internal resistance . 35
7.13.1 General . 35
7.13.2 Measurement of the internal AC resistance . 36
7.13.3 Measurement of the internal DC resistance . 36
8 Mechanical tests . 37
9 Safety requirements . 37
10 Type approval and batch acceptance . 37
10.1 General . 37
10.2 Type approval . 37
10.2.1 Type approval for small prismatic cells and button cells . 37
10.2.2 Type approval for cylindrical cells . 41
10.2.3 Type approval for batteries . 43
10.3 Batch acceptance . 44
Bibliography . 46
Figure 1 – Jacketed cylindrical cells . 14
Figure 2 – Jacketed small prismatic cells . 14
Figure 3 – Jacketed cells dimensionally interchangeable with primary cells . 15
Figure 4 – Button cells . 17
Figure 5 – 9 V type nickel-metal hydride batteries . 17
Table 1 – Dimensions of jacketed small prismatic cells . 14
Table 2 – Dimensions of jacketed cylindrical cells dimensionally interchangeable with
primary cells . 15
Table 3 – Dimensions of jacketed cylindrical cells not dimensionally interchangeable
with primary cells . 16
Table 4 – Dimensions of button cells. 17
Table 5 – Dimensions of 9 V type nickel-metal hydride batteries . 18
Table 6 – Discharge performance at 20 °C for small prismatic cells and cylindrical cells . 19
Table 7 – Discharge performance at 20 °C for button cells . 19
Table 8 – Discharge performance at 20 °C for batteries . 20
Table 9 – Rated capacity (mAh) compliance test (example) . 20
Table 10 – Discharge performance at 0 °C for small prismatic cells and cylindrical cells . 21
Table 11 – Discharge performance at 0 °C for button cells . 21
Table 12 – Endurance in cycles for small prismatic, button and cylindrical cells not
dimensionally interchangeable with primary cells . 22
Table 13 – Endurance in cycles for H or X cells . 23
Table 14 – Endurance in cycles for X cells . 23
Table 15 – Endurance in cycles for HR or XR cells . 24
– 4 – IEC 61951-2:2017 RLV © IEC 2017
Table 16 – Endurance in cycles for cylindrical cells dimensionally interchangeable with
primary cells . 24
Table 17 – Permanent charge endurance for L, M, H or X cells . 25
Table 18 – Permanent charge endurance for LT, MT or HT cells . 27
Table 19 – Permanent charge endurance for LU, MU or HU cells . 29
Table 20 – Overcharge at 0 °C . 30
Table 21 – Capacity deterioration due to storage period for cells or batteries . 33
Table 22 – Capacity deterioration due to storage period for cells or batteries (high
recovery type) . 34
Table 23 – Charge and discharge at +55 °C . 35
Table 24 – Trickle charge acceptance for JT cylindrical cells . 35
Table 25 – Constant discharge currents used for measurement of DC resistance . 37
Table 26 – Sequence of tests for type approval for small prismatic and for button cells. 38
Table 27 – Sequence of tests for type approval for small prismatic cells (high recovery
type) . 39
Table 28 – Sequence of tests for type approval for button cells . 40
Table 29 – Sequence of tests for type approval for button cells (high recovery type) . 41
Table 30 – Sequence of tests for type approval for cylindrical cells . 42
Table 31 – Sequence of tests for type approval for cylindrical cells (high recovery
type) . 43
Table 32 – Sequence of tests for type approval for batteries . 44
Table 33 – Sequence of tests for type approval for batteries (high recovery type) . 44
Table 34 – Recommended test sequence for batch acceptance . 45
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
PORTABLE SEALED RECHARGEABLE SINGLE CELLS SECONDARY
SEALED CELLS AND BATTERIES FOR PORTABLE APPLICATIONS –
Part 2: Nickel-metal hydride
FOREWORD
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
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has been made. Additions are in green text, deletions are in strikethrough red text.
– 6 – IEC 61951-2:2017 RLV © IEC 2017
International Standard IEC 61951-2 has been prepared by subcommittee 21A: Secondary
cells and batteries containing alkaline or other non-acid electrolytes, of IEC technical
committee 21: Secondary cells and batteries.
This fourth edition cancels and replaces the third edition published in 2011 of which it
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• addition of battery type;
• addition of ‘F’ (high recovery type) designation for cells and batteries;
• addition of ‘I’ (low self-discharge type) designation for cells;
• revision of Figure 3 (6.1.3.1);
• addition of “optional pip” note to positive contact;
• changed leader line position from pip to flats of positive contact (B and G).
The text of this standard is based on the following documents:
FDIS Report on voting
21A/623/FDIS 21A/629/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61951 series can be found, under the general title Secondary cells
and batteries containing alkaline or other non-acid electrolytes – Secondary sealed cells and
batteries for portable applications, on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this publication using a colour printer.
SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
PORTABLE SEALED RECHARGEABLE SINGLE CELLS SECONDARY
SEALED CELLS AND BATTERIES FOR PORTABLE APPLICATIONS –
Part 2: Nickel-metal hydride
1 Scope
This part of IEC 61951 specifies marking, designation, dimensions, tests and requirements for
portable secondary sealed nickel-metal hydride small prismatic, cylindrical and button
rechargeable single cells and batteries, suitable for use in any orientation, for portable
applications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60050-482:2004, International Electrotechnical Vocabulary (IEV) – Part 482: Primary and
secondary cells and batteries
IEC 60086 (all parts), Primary batteries
IEC 60086-1 (2006), Primary batteries – Part 1: General
IEC 60086-2 (2006), Primary batteries – Part 2: Physical and electrical specifications
IEC 60410, Sampling plans and procedures for inspection by attributes
IEC 61959, Secondary cells and batteries containing alkaline or other non-acid electrolytes –
Mechanical tests for sealed portable secondary cells and batteries
IEC 62133-1, Secondary cells and batteries containing alkaline or other non-acid electrolytes
– Safety requirements for portable sealed secondary cells and for batteries made from them,
for use in portable applications – Part 1: Nickel systems
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-482 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
– 8 – IEC 61951-2:2017 RLV © IEC 2017
3.1
nominal voltage
suitable approximate value of the voltage used to designate or identify the voltage of a cell or
a battery
Note 1 to entry: The nominal voltage of a sealed nickel-metal hydride rechargeable single cell is 1,2 V.
Note 2 to entry: The nominal voltage of a battery of n series connected cells is equal to n times the nominal
voltage of a single cell.
[SOURCE: IEC 60050-482:2004, 482-03-31, modified – Addition of Notes 1 and 2 to entry.]
3.2
rated capacity
capacity value of a cell or battery determined under specified conditions and declared by the
manufacturer
Note 1 to entry: The rated capacity is the quantity of electricity C Ah (ampere-hours) declared by the
manufacturer which a single cell can deliver during a 5 h period when charging, storing and discharging under the
conditions specified in 7.3.2.
Note 2 to entry: The capacity of a battery is the quantity of electricity C Ah (ampere-hours) declared by the
manufacturer which a battery can deliver during a 5 h period, when charged, stored and discharged under the
procedure described in 7.3.2.
[SOURCE: IEC 60050-482:2004, 482-03-15, modified – Addition of Notes 1 and 2 to entry.]
3.3
small prismatic cell
cell in the form of a rectangular parallelepiped whose width and thickness dimensions are not
more than 25 mm
3.4
cylindrical cell
cell of circular cross-section in which the overall height is equal to, or greater than the overall
diameter
3.5
button cell
cell of circular cross-section in which the overall height is less than the overall diameter
3.6
nickel-metal hydride cell
cell containing a nickel hydroxide compound for the positive electrode, a hydrogen absorbing
alloy for the negative electrode, and potassium hydroxide or other alkaline solution as
electrolyte
Note 1 to entry: Positive electrodes are isolated from negative electrodes by a separator
3.7
nickel-metal hydride battery
assembly of secondary cell(s) as a source of electrical energy characterized by its voltage,
size, terminal arrangement, capacity and rate capability
3.8
sealed cell
cell which remains closed and does not release either gas or liquid when operated within the
limits of charge and temperature specified by the manufacturer
Note 1 to entry: The cell is equipped with a safety device to prevent dangerously high internal pressure.
Note 2 to entry: The cell does not require addition to the electrolyte and is designed to operate during its life in its
original sealed state.
Note 3 to entry: The nickel-metal hydride cell, however, may release gas towards the end of its life due to the
accumulation of hydrogen in the cell.
[SOURCE: IEC 60050-482:2004, 482-05-17, modified – The existing note has been developed
into Notes 1, 2 and 3 to entry.]
3.9
portable cell
cell designed mainly for use in an easily hand-carried battery
3.10
battery for portable applications
battery for use in device or appliance which is conveniently hand-carried
3.11
surface temperature limited cell
cell which performs a function that prevents the temperature increase from a certain standard
point even at the moment of anomaly an abnormal occurrence such as short circuit of cell
3.12
high recovery type cell or battery
cell or battery which has lower “permanent capacity loss” than normal type after storage
Note 1 to entry: It is defined as “high recovery type” in 7.10.2, Table 22.
3.13
low self-discharge type cell
cell which is able to retain higher charge capacity than normal type after storage by reducing
self-discharge
Note 1 to entry: It is defined as “low self-discharge type” in 7.4.
3.14
9 V type nickel-metal hydride battery
nickel-metal hydride battery which is interchangeable with 9 V primary batteries and is
composed of cylindrical cells, small prismatic cells or button cells
4 Parameter measurement tolerances
The overall accuracy of controlled or measured values, relative to the specified or actual
values, shall be within the following tolerances:
a) ±1 % for voltage;
b) ±1 % for current;
c) ±1 % for capacity;
d) ±2 °C for temperature;
e) ±0,1 % for time;
f) ±0,1 mm for dimensions;
g) ± 2 5 % for humidity.
These tolerances comprise the combined accuracy of the measuring instruments, the
measurement techniques used and all other sources of error in the test procedure.
The details of the instrumentation used shall be provided in each report of results.
– 10 – IEC 61951-2:2017 RLV © IEC 2017
5 Cell and battery designation and marking
5.1 Cell and battery designation
5.1.1 Small prismatic cells and cylindrical cells
5.1.1.1 General
Sealed nickel-metal hydride small prismatic rechargeable single cells and cylindrical
rechargeable single cells shall be designated by a letter L, M, J, H or X which signifies:
• low rate of discharge (L);
• medium rate of discharge (M);
• medium high rate of discharge (J);
• high rate of discharge (H);
• very high rate of discharge (X).
NOTE 1 These cells are typically but not exclusively used for the following discharge rates:
• L up to 0,5 I A;
t
• M up to 3,5 I A;
t
• J up to 5,0 I A;
t
• H up to 7,0 I A;
t
• X up to and above 7,0 I A.
t
NOTE 2 These currents are expressed as multiples of I A, where I A = C Ah/1 h (see IEC 61434).
t t 5
When a cell is intended for permanent charge at elevated temperatures, typically higher than
40 °C, a letter "T" is placed after the letter L, M, J, H or X.
When a cell is intended for permanent charge at elevated temperatures, typically higher than
50 °C, a letter "U" is placed after the letter L, M, J, H or X.
When a cell is intended for surface temperature limitation, a letter “S” is placed after the
letter L or M.
When a cell is intended for rapid charge, typically at 1,0 I A, a letter "R" is placed after the
t
letter L, M, J, H or X.
When a cell or battery is intended as a high recovery type, a letter “F” is placed after the letter
L, M, J, H or X.
When a cell is intended as a low self-discharge cell, a letter “I” is placed after the
letter L, M, J, H or X.
5.1.1.2 Small prismatic cells
Sealed nickel-metal hydride small prismatic rechargeable single cells shall be designated by
the letters "HF" followed by a letter L, M, J, H or X followed by letter F, followed by, if
designated, letter I, followed by three groups of figures, each group being separated by a
solidus, as follows:
a) The two figures to the left of the first solidus shall indicate the maximum width specified
for the cell, expressed in millimetres, rounded up to the next whole number.
b) The two figures in the middle shall indicate the maximum thickness specified for the cell,
expressed in millimetres, rounded up to the next whole number.
c) The two figures to the right of the second solidus shall indicate the maximum height
specified for the cell, expressed in millimetres, rounded up to the next whole number.
EXAMPLE HFLF 18/07/49 designation identifies a small prismatic cell of low discharge rate capability, high
recovery type with a maximum width of 18 mm, a maximum thickness of 7 mm and a maximum height of 49 mm.
5.1.1.3 Cylindrical cells
Sealed nickel-metal hydride cylindrical rechargeable single cells shall be designated by the
letters "HR" followed by a letter L, M, J, H or X followed by letter F, followed by, if designated,
letter I, followed by two groups of figures, each group being separated by a solidus, as
follows:
a) The two figures to the left of the solidus shall indicate the maximum diameter specified for
the cell, expressed in millimetres, rounded up to the next whole number.
b) The two figures to the right of the solidus shall indicate the maximum height specified for
the cell, expressed in millimetres, rounded up to the next whole number.
When a manufacturer designs a cell with dimensions and tolerances which make it
interchangeable with a primary cell, the designation of Table 2 shall also be marked on the
cell.
EXAMPLE 1 HRLF 33/62 designation identifies a cylindrical cell of low discharge rate capability, high recovery
type with a maximum diameter of 33 mm and a maximum height of 61,5 mm.
EXAMPLE 2 HRLTF 33/62 designation identifies a cylindrical cell of low discharge rate capability, intended for
permanent charge at elevated temperatures, high recovery type, with a maximum diameter of 33 mm and a
maximum height of 61,5 mm.
EXAMPLE 3 HRXRFI 23/43 designation identifies a cylindrical cell of very high discharge rate capability, intended
for rapid charge, high recovery type, low self-discharge type with a maximum diameter of 23 mm and a maximum
height of 43 mm.
For cells dimensionally interchangeable with primary cells, the following single or double
figures following the letter L, M, R or S F or I may indicate:
• 20- Size D;
• 14- Size C;
• 6- Size AA;
• 03- Size AAA.
NOTE Cells dimensionally interchangeable with primary cells correspond to M type unless otherwise specified
For the purpose of this explanation, an example is given below.
EXAMPLE 4 HRMRFI03 designation identifies a sealed nickel-metal hydride cylindrical rechargeable single cell,
of medium discharge rate capability, also intended for rapid charge, high recovery type and low self-discharge
type, dimensionally interchangeable with primary cell and whose type designation is AAA.
5.1.2 Button cells
Sealed nickel-metal hydride button rechargeable single cells shall be designated by the letters
"HB" followed by letter F, followed by, if designated, letter I, followed by two groups of figures,
each group being separated by a solidus, as follows:
a) The three figures to the left of the solidus shall indicate the maximum diameter specified
for the cell, expressed in tenths of millimetres, rounded up to the next whole number.
b) The three figures to the right of the solidus shall indicate the maximum height specified for
the cell, expressed in tenths of millimetres, rounded up to the next whole number.
EXAMPLE HBFI 116/054 designation identifies a button cell, intended as a high recovery type, low self-discharge
type, with a maximum diameter of 11,6 mm and a maximum height of 5,4 mm.
– 12 – IEC 61951-2:2017 RLV © IEC 2017
5.1.3 Batteries
Sealed nickel-metal hydride rechargeable batteries shall be designated with the following
form:
N1 single cell designation – N2
where
N1 is the number of series connected cells in the battery;
N2 is the number of parallel connected cells if 2 or greater (not shown if value is 1).
Sealed nickel-metal hydride battery designation will be identified based on single cells within
the series and not the battery as a whole.
• Small prismatic cells in battery
EXAMPLE 1 2HFLF 18/07/49 designation identifies a small prismatic cell of low discharge rate capability,
high recovery type with a maximum width of 18 mm, a maximum thickness of 7 mm and a maximum height of
49 mm with two series connected cells.
• Cylindrical cells in battery
EXAMPLE 2 3HRLF 33/62 designation identifies a cylindrical cell of low discharge rate capability, high
recovery type with a maximum diameter of 33 mm and a maximum height of 61,5 mm with three series
connected cells.
EXAMPLE 3 4HRLTF 33/62 designation identifies a cylindrical cell of low discharge rate capability, intended
for permanent charge at elevated temperatures, high recovery type, with a maximum diameter of 33 mm and a
maximum height of 61,5 mm with four series connected cells.
EXAMPLE 4 HRXRFI 23/43 -2 designation identifies a cylindrical cell of very high discharge rate capability,
intended for rapid charge, high recovery type, low self-discharge type with a maximum diameter of 23 mm and
a maximum height of 43 mm with two parallel connected cells.
• Cells interchangeable with primary cells in batteries
EXAMPLE 5 HRMRFI03-3 designation identifies a sealed nickel-metal hydride cylindrical rechargeable single
cell, of medium discharge rate capability, also intended for rapid charge, high recovery type and low self-
discharge type, dimensionally interchangeable with primary cell whose type designation is AAA with three
parallel connected cells.
• Button cells in battery
EXAMPLE 6 HB 116/054-3 designation identifies a button cell, with a maximum diameter of 11,6 mm and a
maximum height of 5,4 mm with three parallel connected cells.
5.2 Cell or battery termination
This standard does not specify cell or battery termination.
5.3 Marking
5.3.1 Small prismatic cells and cylindrical cells
Each jacketed cell supplied without connections shall carry durable markings giving the
following minimum information:
• sealed rechargeable nickel-metal hydride or Ni-MH;
• designation as specified in 5.1 (in addition, it is permissible for a manufacturer to use his
own type designation);
• rated capacity;
• nominal voltage;
• recommended charge rate and time or permanent charge current for "T" cells;
• polarity (+ and –);
• date of manufacture (which may be in code);
• name or identification of manufacturer or supplier;
• mark for promoting useful use of cell resources.
NOTE 1 This mark is applied where a recycling programme is available.
NOTE 2 In general, sealed nickel-metal hydride rechargeable single cells with connection tabs need no labels if
they form an integral part of a battery, in which case, the battery itself is marked with the above information.
5.3.2 Button cells
Each button cell supplied without connection shall carry durable markings giving the following
minimum information:
• designation as specified in 5.1;
• polarity (+ and –);
• date of manufacture (which may be in code);
• name or identification of manufacturer or supplier.
5.3.3 Batteries
Each battery shall carry durable markings giving the following minimum information:
• rated capacity;
• nominal voltage;
• date of manufacture (which may be in code).
5.4 Exemption of wording
Each cell or battery shall include minimum information on the label as specified in 5.3.1
to 5.3.3. Therefore, additional information such as safety cautions should be included in the
form of a manual not on the cell or battery label.
Each cell or battery shall include minimum information on the label as specified in 5.3.1 to
5.3.3. Therefore, cells or batteries encased in soft or hard plastic with the safety cautions
printed on the outside should not include caution details on the cell or battery label.
6 Dimensions
6.1 Small prismatic cells and cylindrical cells
6.1.1 General
Figures 1 and 2 show the shape of the cells.
– 14 – IEC 61951-2:2017 RLV © IEC 2017
Thickness
Diameter
Width
(+) (+)
(–)
(–)
IEC IEC
Figure 1 – Jacketed cylindrical cells Figure 2 – Jacketed small prismatic cells
6.1.2 Small prismatic cells
Table 1 shows the dimensions for jacketed small prismatic cells.
Table 1 – Dimensions of jacketed small prismatic cells
Cell designation Width Thickness Height
mm mm mm
HF 15/08/49 14,5 7,4 48,2
HF 15/09/49 14,5 8,3 48,2
a
HF 16/07/34 16,0 6,6 34,0 0
0 –1,0
HF 18/07/36 17,3 6,1 35,7
–0,7
HF 18/07/49 17,3 6,1 48,2
HF 18/09/49 17,3 8,3 48,2
–1,0
HF 18/07/68 17,3 6,1 67,3
HF 18/11/68 17,3 10,7 67,3
HF 18/18/68 17,3 17,3 67,3 0
–1,0
–1,5
HF 23/11/68 22,7 10,7 67,3
HF 23/15/68 22,7 14,5 67,3
a
New cell.
6.1.3 Cylindrical cells
6.1.3.1 Cells dimensionally interchangeable with primary cells
Table 2 gives the requirements relative to the dimensions for jacketed cylindrical cells which
are dimensionally interchangeable with primary cells (see Figure 3).
Height
Height
Table 2 – Dimensions of jacketed cylindrical cells
dimensionally interchangeable with primary cells
Dimensions
mm
Type Corresponding Nominal
Cell
designation primary cell voltage
a d
designation A B C D E F G Φ ΦP
b c
(reference) CEI 60086 V
Max Min Min – Max Max Min Min Max Min Max
R03
HR03 AAA 44,5 (43,3) 4,3 0,5 3,8 (2,0) 0,8 10,5 9,5 0,4
LR03
R6
HR6 AA 50,5 (49,2) 7,0 0,5 5,5 (4,2) 1,0 14,5 13,5 0,5
LR6
1,2
R14
HR14 C 50,0 (48,6) 13,0 0,9 7,5 (5,5) 1,5 26,2 24,9 1,0
LR14
R20
HR20 D 61,5 (59,5) 18,0 1,0 9,5 (7,8) 1,5 34,2 32,3 1,0
LR20
NOTE Figures in parentheses are reference values.
a
Cell designations shall be in accordance with the nomenclature rules given in IEC 60086-1.
b
In some countries these cell types are also known as AAA (R 03); AA (R 6); C (R 14); D (R 20).
c
Carbon zinc cells (R) and alkaline primary cells (LR) shall be compliant with the provisions of IEC 60086-2, respectively.
d
There is no specification for the value “D” for sealed nickel-metal-hydride cylindrical rechargeable single cells
interchangeable with primary cells.
Optional pip
F
Key
A maximum overall height of the cell
B minimum distance between the flats of the positive and the
negative contacts
C minimum outer diameter of the negative flat contact surface
D maximum inner diameter of the negative flat contact surface
E maximum recess of the negative flat contact surface
F maximum diameter of the positive contact within the specified
projection height
G minimum projection of the flat positive contact
D
∅ maximum and minimum diameters of the cell
C ∅P concentricity of the positive contact
ø
IEC
Figure 3 – Jacketed cells dimensionally interchangeable with primary cells
6.1.3.2 Cells not dimensionally interchangeable with primary cells
Table 3 shows the dimensions for jacketed cylindrical cells not dimensionally interchangeable
with primary cells.
øP
B
E G
E
A
– 16 – IEC 61951-2:2017 RLV © IEC 2017
Table 3 – Dimensions of jacketed cylindrical cells
not dimensionally interchangeable with primary cells
a
Cell designation Diameter Height
mm mm
HR 11/45 10,5 44,5
HR 11/51 10,5 50,5
HR 11/67 10,5 67,0
HR 15/43 14,5 43,0
HR 15/49 14,5 49,0 0
–1,5
HR 15/51 14,5 50,5
b
HR 15/67 15,0 67,0
HR 17/29 17,0 28,5
–0,7
HR 17/43 17,0 43,0
HR 17/50 17,0 50,0
HR 17/67 17,0 67,0
–2,0
b
HR 18/44 18,0 43,5
b
HR 18/67 18,0 67,0
b
HR 19/67 19,0 67,0
HR 23/34 23,0 34,0
HR 23/43 23,0 43,0
–1,5
b
HR 23/44 23,0 43,5
b
HR 23/50 23,0 50,0
b
HR 23/60 23,0 61,0
HR 26/47 25,8 47,0
–1,0
HR 26/50 25,8 50,0
HR 33/36 33,0 36,0
–2,0
HR 33/62 33,0 61,5
HR 33/91 33,0 91,0
0 / –2,5
b
0 / –2,0
HR 34/60 33,5 59,5
a
The letters HR to be followed by L, M, H or X and T and/or R as appropriate (see 5.1).
b
8 new cells.
6.2 Button cells
Cells shall be constructed as design I or II (see Figure 4 below).
DESIGN I DESIGN II
–
+
d
d
IEC
IEC
NOTE The polarity of design I is not standardized.
Figure 4 – Button cells
Table 4 shows the dimensions of sealed nickel
...
IEC 61951-2 ®
Edition 4.0 2017-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Secondary sealed cells and batteries for portable applications –
Part 2: Nickel-metal hydride
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Accumulateurs étanches pour applications portables –
Partie 2: Nickel-métal hydrure
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IEC 61951-2 ®
Edition 4.0 2017-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Secondary sealed cells and batteries for portable applications –
Part 2: Nickel-metal hydride
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Accumulateurs étanches pour applications portables –
Partie 2: Nickel-métal hydrure
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.30 ISBN 978-2-8322-4011-3
– 2 – IEC 61951-2:2017 © IEC 2017
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Parameter measurement tolerances . 9
5 Cell and battery designation and marking . 10
5.1 Cell and battery designation . 10
5.1.1 Small prismatic cells and cylindrical cells . 10
5.1.2 Button cells. 11
5.1.3 Batteries . 12
5.2 Cell or battery termination . 12
5.3 Marking . 12
5.3.1 Small prismatic cells and cylindrical cells . 12
5.3.2 Button cells. 13
5.3.3 Batteries . 13
5.4 Exemption of wording. 13
6 Dimensions. 13
6.1 Small prismatic cells and cylindrical cells . 13
6.1.1 General . 13
6.1.2 Small prismatic cells . 14
6.1.3 Cylindrical cells . 14
6.2 Button cells . 16
6.3 9 V type nickel-metal hydride batteries . 17
7 Electrical tests . 18
7.1 General . 18
7.2 Charging procedure for test purposes . 18
7.2.1 Charging procedure for cell. 18
7.2.2 Charging procedure for battery . 18
7.3 Discharge performance . 18
7.3.1 General . 18
7.3.2 Discharge performance at 20 °C . 19
7.3.3 Discharge performance at 0 °C . 20
7.3.4 Discharge performance for rapid charge cells (R cells) . 21
7.4 Charge (capacity) retention . 21
7.5 Endurance . 22
7.5.1 Endurance in cycles. 22
7.5.2 Permanent charge endurance . 25
7.6 Charge acceptance at constant voltage . 28
7.7 Overcharge . 28
7.7.1 Small prismatic, L, M, H, X, LS or MS cylindrical, and button cells . 28
7.7.2 LT/LU, MT/MU or HT/HU cylindrical cells . 29
7.7.3 J cylindrical cells . 29
7.7.4 JT cylindrical cells . 29
7.7.5 R cylindrical cells . 30
7.8 Safety device operation . 30
7.9 Surface temperature limitation device operation (for S cell only) . 30
7.10 Storage . 31
7.10.1 Button cells or batteries, small prismatic cells or batteries, cylindrical
cells or batteries . 31
7.10.2 Button cells or batteries, small prismatic cells or batteries, cylindrical
cells or batteries (high recovery type) . 32
7.11 Charge acceptance at +55 °C for LT, MT or HT cylindrical cells . 33
7.12 Trickle charge acceptance for JT cylindrical cells . 34
7.13 Internal resistance . 34
7.13.1 General . 34
7.13.2 Measurement of the internal AC resistance . 35
7.13.3 Measurement of the internal DC resistance . 35
8 Mechanical tests . 36
9 Safety requirements . 36
10 Type approval and batch acceptance . 36
10.1 General . 36
10.2 Type approval . 36
10.2.1 Type approval for small prismatic cells and button cells . 36
10.2.2 Type approval for cylindrical cells . 40
10.2.3 Type approval for batteries . 42
10.3 Batch acceptance . 43
Bibliography . 45
Figure 1 – Jacketed cylindrical cells . 14
Figure 2 – Jacketed small prismatic cells . 14
Figure 3 – Jacketed cells dimensionally interchangeable with primary cells . 15
Figure 4 – Button cells . 17
Figure 5 – 9 V type nickel-metal hydride batteries . 17
Table 1 – Dimensions of jacketed small prismatic cells . 14
Table 2 – Dimensions of jacketed cylindrical cells dimensionally interchangeable with
primary cells . 15
Table 3 – Dimensions of jacketed cylindrical cells not dimensionally interchangeable
with primary cells . 16
Table 4 – Dimensions of button cells. 17
Table 5 – Dimensions of 9 V type nickel-metal hydride batteries . 18
Table 6 – Discharge performance at 20 °C for small prismatic cells and cylindrical cells . 19
Table 7 – Discharge performance at 20 °C for button cells . 19
Table 8 – Discharge performance at 20 °C for batteries . 20
Table 9 – Rated capacity (mAh) compliance test (example) . 20
Table 10 – Discharge performance at 0 °C for small prismatic cells and cylindrical cells . 21
Table 11 – Discharge performance at 0 °C for button cells . 21
Table 12 – Endurance in cycles for small prismatic, button and cylindrical cells not
dimensionally interchangeable with primary cells . 22
Table 13 – Endurance in cycles for H or X cells . 23
Table 14 – Endurance in cycles for X cells . 23
Table 15 – Endurance in cycles for HR or XR cells . 24
– 4 – IEC 61951-2:2017 © IEC 2017
Table 16 – Endurance in cycles for cylindrical cells dimensionally interchangeable with
primary cells . 24
Table 17 – Permanent charge endurance for L, M, H or X cells . 25
Table 18 – Permanent charge endurance for LT, MT or HT cells . 26
Table 19 – Permanent charge endurance for LU, MU or HU cells . 28
Table 20 – Overcharge at 0 °C . 29
Table 21 – Capacity deterioration due to storage period for cells or batteries . 32
Table 22 – Capacity deterioration due to storage period for cells or batteries (high
recovery type) . 33
Table 23 – Charge and discharge at +55 °C . 34
Table 24 – Trickle charge acceptance for JT cylindrical cells . 34
Table 25 – Constant discharge currents used for measurement of DC resistance . 36
Table 26 – Sequence of tests for type approval for small prismatic cells . 37
Table 27 – Sequence of tests for type approval for small prismatic cells (high recovery
type) . 38
Table 28 – Sequence of tests for type approval for button cells . 39
Table 29 – Sequence of tests for type approval for button cells (high recovery type) . 40
Table 30 – Sequence of tests for type approval for cylindrical cells . 41
Table 31 – Sequence of tests for type approval for cylindrical cells (high recovery
type) . 42
Table 32 – Sequence of tests for type approval for batteries . 43
Table 33 – Sequence of tests for type approval for batteries (high recovery type) . 43
Table 34 – Recommended test sequence for batch acceptance . 44
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
SECONDARY SEALED CELLS AND BATTERIES
FOR PORTABLE APPLICATIONS –
Part 2: Nickel-metal hydride
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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agreement between the two organizations.
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6) All users should ensure that they have the latest edition of this publication.
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Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61951-2 has been prepared by subcommittee 21A: Secondary
cells and batteries containing alkaline or other non-acid electrolytes, of IEC technical
committee 21: Secondary cells and batteries.
This fourth edition cancels and replaces the third edition published in 2011 of which it
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• addition of battery type;
• addition of ‘F’ (high recovery type) designation for cells and batteries;
• addition of ‘I’ (low self-discharge type) designation for cells;
– 6 – IEC 61951-2:2017 © IEC 2017
• revision of Figure 3 (6.1.3.1);
• addition of “optional pip” note to positive contact;
• changed leader line position from pip to flats of positive contact (B and G).
The text of this standard is based on the following documents:
FDIS Report on voting
21A/623/FDIS 21A/629/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61951 series can be found, under the general title Secondary cells
and batteries containing alkaline or other non-acid electrolytes – Secondary sealed cells and
batteries for portable applications, on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
SECONDARY SEALED CELLS AND BATTERIES
FOR PORTABLE APPLICATIONS –
Part 2: Nickel-metal hydride
1 Scope
This part of IEC 61951 specifies marking, designation, dimensions, tests and requirements for
secondary sealed nickel-metal hydride small prismatic, cylindrical and button cells and
batteries, suitable for use in any orientation, for portable applications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60050-482:2004, International Electrotechnical Vocabulary (IEV) – Part 482: Primary and
secondary cells and batteries
IEC 60086-1, Primary batteries – Part 1: General
IEC 60086-2, Primary batteries – Part 2: Physical and electrical specifications
IEC 61959, Secondary cells and batteries containing alkaline or other non-acid electrolytes –
Mechanical tests for sealed portable secondary cells and batteries
IEC 62133-1, Secondary cells and batteries containing alkaline or other non-acid electrolytes
– Safety requirements for portable sealed secondary cells and for batteries made from them,
for use in portable applications – Part 1: Nickel systems
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-482 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
nominal voltage
suitable approximate value of the voltage used to designate or identify a cell or a battery
Note 1 to entry: The nominal voltage of a sealed nickel-metal hydride rechargeable single cell is 1,2 V.
Note 2 to entry: The nominal voltage of a battery of n series connected cells is equal to n times the nominal
voltage of a single cell.
– 8 – IEC 61951-2:2017 © IEC 2017
[SOURCE: IEC 60050-482:2004, 482-03-31, modified – Addition of Notes 1 and 2 to entry.]
3.2
rated capacity
capacity value of a cell or battery determined under specified conditions and declared by the
manufacturer
Note 1 to entry: The rated capacity is the quantity of electricity C Ah (ampere-hours) declared by the
manufacturer which a single cell can deliver during a 5 h period when charging, storing and discharging under the
conditions specified in 7.3.2.
Note 2 to entry: The capacity of a battery is the quantity of electricity C Ah (ampere-hours) declared by the
manufacturer which a battery can deliver during a 5 h period, when charged, stored and discharged under the
procedure described in 7.3.2.
[SOURCE: IEC 60050-482:2004, 482-03-15, modified – Addition of Notes 1 and 2 to entry.]
3.3
small prismatic cell
cell in the form of a rectangular parallelepiped whose width and thickness dimensions are not
more than 25 mm
3.4
cylindrical cell
cell of circular cross-section in which the overall height is equal to, or greater than the overall
diameter
3.5
button cell
cell of circular cross-section in which the overall height is less than the overall diameter
3.6
nickel-metal hydride cell
cell containing a nickel hydroxide compound for the positive electrode, a hydrogen absorbing
alloy for the negative electrode, and potassium hydroxide or other alkaline solution as
electrolyte
Note 1 to entry: Positive electrodes are isolated from negative electrodes by a separator
3.7
nickel-metal hydride battery
assembly of secondary cell(s) as a source of electrical energy characterized by its voltage,
size, terminal arrangement, capacity and rate capability
3.8
sealed cell
cell which remains closed and does not release either gas or liquid when operated within the
limits of charge and temperature specified by the manufacturer
Note 1 to entry: The cell is equipped with a safety device to prevent dangerously high internal pressure.
Note 2 to entry: The cell does not require addition to the electrolyte and is designed to operate during its life in its
original sealed state.
Note 3 to entry: The nickel-metal hydride cell, however, may release gas towards the end of its life due to the
accumulation of hydrogen in the cell.
[SOURCE: IEC 60050-482:2004, 482-05-17, modified – The existing note has been developed
into Notes 1, 2 and 3 to entry.]
3.9
portable cell
cell designed mainly for use in an easily hand-carried battery
3.10
battery for portable applications
battery for use in device or appliance which is conveniently hand-carried
3.11
surface temperature limited cell
cell which performs a function that prevents the temperature increase from a certain standard
point even at the moment of an abnormal occurrence such as short circuit of cell
3.12
high recovery type cell or battery
cell or battery which has lower “permanent capacity loss” than normal type after storage
Note 1 to entry: It is defined as “high recovery type” in 7.10.2, Table 22.
3.13
low self-discharge type cell
cell which is able to retain higher charge capacity than normal type after storage by reducing
self-discharge
Note 1 to entry: It is defined as “low self-discharge type” in 7.4.
3.14
9 V type nickel-metal hydride battery
nickel-metal hydride battery which is interchangeable with 9 V primary batteries and is
composed of cylindrical cells, small prismatic cells or button cells
4 Parameter measurement tolerances
The overall accuracy of controlled or measured values, relative to the specified or actual
values, shall be within the following tolerances:
a) ±1 % for voltage;
b) ±1 % for current;
c) ±1 % for capacity;
d) ±2 °C for temperature;
e) ±0,1 % for time;
f) ±0,1 mm for dimensions;
g) ±5 % for humidity.
These tolerances comprise the combined accuracy of the measuring instruments, the
measurement techniques used and all other sources of error in the test procedure.
The details of the instrumentation used shall be provided in each report of results.
– 10 – IEC 61951-2:2017 © IEC 2017
5 Cell and battery designation and marking
5.1 Cell and battery designation
5.1.1 Small prismatic cells and cylindrical cells
5.1.1.1 General
Sealed nickel-metal hydride small prismatic rechargeable single cells and cylindrical
rechargeable single cells shall be designated by a letter L, M, J, H or X which signifies:
• low rate of discharge (L);
• medium rate of discharge (M);
• medium high rate of discharge (J);
• high rate of discharge (H);
• very high rate of discharge (X).
NOTE 1 These cells are typically but not exclusively used for the following discharge rates:
• L up to 0,5 I A;
t
• M up to 3,5 I A;
t
• J up to 5,0 I A;
t
• H up to 7,0 I A;
t
• X up to and above 7,0 I A.
t
NOTE 2 These currents are expressed as multiples of I A, where I A = C Ah/1 h (see IEC 61434).
t t 5
When a cell is intended for permanent charge at elevated temperatures, typically higher than
40 °C, a letter "T" is placed after the letter L, M, J, H or X.
When a cell is intended for permanent charge at elevated temperatures, typically higher than
50 °C, a letter "U" is placed after the letter L, M, J, H or X.
When a cell is intended for surface temperature limitation, a letter “S” is placed after the
letter L or M.
When a cell is intended for rapid charge, typically at 1,0 I A, a letter "R" is placed after the
t
letter L, M, J, H or X.
When a cell or battery is intended as a high recovery type, a letter “F” is placed after the letter
L, M, J, H or X.
When a cell is intended as a low self-discharge cell, a letter “I” is placed after the
letter L, M, J, H or X.
5.1.1.2 Small prismatic cells
Sealed nickel-metal hydride small prismatic rechargeable single cells shall be designated by
the letters "HF" followed by a letter L, M, J, H or X followed by letter F, followed by, if
designated, letter I, followed by three groups of figures, each group being separated by a
solidus, as follows:
a) The two figures to the left of the first solidus shall indicate the maximum width specified
for the cell, expressed in millimetres, rounded up to the next whole number.
b) The two figures in the middle shall indicate the maximum thickness specified for the cell,
expressed in millimetres, rounded up to the next whole number.
c) The two figures to the right of the second solidus shall indicate the maximum height
specified for the cell, expressed in millimetres, rounded up to the next whole number.
EXAMPLE HFLF 18/07/49 designation identifies a small prismatic cell of low discharge rate capability, high
recovery type with a maximum width of 18 mm, a maximum thickness of 7 mm and a maximum height of 49 mm.
5.1.1.3 Cylindrical cells
Sealed nickel-metal hydride cylindrical rechargeable single cells shall be designated by the
letters "HR" followed by a letter L, M, J, H or X followed by letter F, followed by, if designated,
letter I, followed by two groups of figures, each group being separated by a solidus, as
follows:
a) The two figures to the left of the solidus shall indicate the maximum diameter specified for
the cell, expressed in millimetres, rounded up to the next whole number.
b) The two figures to the right of the solidus shall indicate the maximum height specified for
the cell, expressed in millimetres, rounded up to the next whole number.
When a manufacturer designs a cell with dimensions and tolerances which make it
interchangeable with a primary cell, the designation of Table 2 shall also be marked on the
cell.
EXAMPLE 1 HRLF 33/62 designation identifies a cylindrical cell of low discharge rate capability, high recovery
type with a maximum diameter of 33 mm and a maximum height of 61,5 mm.
EXAMPLE 2 HRLTF 33/62 designation identifies a cylindrical cell of low discharge rate capability, intended for
permanent charge at elevated temperatures, high recovery type, with a maximum diameter of 33 mm and a
maximum height of 61,5 mm.
EXAMPLE 3 HRXRFI 23/43 designation identifies a cylindrical cell of very high discharge rate capability, intended
for rapid charge, high recovery type, low self-discharge type with a maximum diameter of 23 mm and a maximum
height of 43 mm.
For cells dimensionally interchangeable with primary cells, the following single or double
figures following the letter F or I may indicate:
• 20- Size D;
• 14- Size C;
• 6- Size AA;
• 03- Size AAA.
NOTE Cells dimensionally interchangeable with primary cells correspond to M type unless otherwise specified
For the purpose of this explanation, an example is given below.
EXAMPLE 4 HRMRFI03 designation identifies a sealed nickel-metal hydride cylindrical rechargeable single cell,
of medium discharge rate capability, also intended for rapid charge, high recovery type and low self-discharge
type, dimensionally interchangeable with primary cell and whose type designation is AAA.
5.1.2 Button cells
Sealed nickel-metal hydride button rechargeable single cells shall be designated by the letters
"HB" followed by letter F, followed by, if designated, letter I, followed by two groups of figures,
each group being separated by a solidus, as follows:
a) The three figures to the left of the solidus shall indicate the maximum diameter specified
for the cell, expressed in tenths of millimetres, rounded up to the next whole number.
b) The three figures to the right of the solidus shall indicate the maximum height specified for
the cell, expressed in tenths of millimetres, rounded up to the next whole number.
EXAMPLE HBFI 116/054 designation identifies a button cell, intended as a high recovery type, low self-discharge
type, with a maximum diameter of 11,6 mm and a maximum height of 5,4 mm.
– 12 – IEC 61951-2:2017 © IEC 2017
5.1.3 Batteries
Sealed nickel-metal hydride rechargeable batteries shall be designated with the following
form:
N1 single cell designation – N2
where
N1 is the number of series connected cells in the battery;
N2 is the number of parallel connected cells if 2 or greater (not shown if value is 1).
Sealed nickel-metal hydride battery designation will be identified based on single cells within
the series and not the battery as a whole.
• Small prismatic cells in battery
EXAMPLE 1 2HFLF 18/07/49 designation identifies a small prismatic cell of low discharge rate capability,
high recovery type with a maximum width of 18 mm, a maximum thickness of 7 mm and a maximum height of
49 mm with two series connected cells.
• Cylindrical cells in battery
EXAMPLE 2 3HRLF 33/62 designation identifies a cylindrical cell of low discharge rate capability, high
recovery type with a maximum diameter of 33 mm and a maximum height of 61,5 mm with three series
connected cells.
EXAMPLE 3 4HRLTF 33/62 designation identifies a cylindrical cell of low discharge rate capability, intended
for permanent charge at elevated temperatures, high recovery type, with a maximum diameter of 33 mm and a
maximum height of 61,5 mm with four series connected cells.
EXAMPLE 4 HRXRFI 23/43 -2 designation identifies a cylindrical cell of very high discharge rate capability,
intended for rapid charge, high recovery type, low self-discharge type with a maximum diameter of 23 mm and
a maximum height of 43 mm with two parallel connected cells.
• Cells interchangeable with primary cells in batteries
EXAMPLE 5 HRMRFI03-3 designation identifies a sealed nickel-metal hydride cylindrical rechargeable single
cell, of medium discharge rate capability, also intended for rapid charge, high recovery type and low self-
discharge type, dimensionally interchangeable with primary cell whose type designation is AAA with three
parallel connected cells.
• Button cells in battery
EXAMPLE 6 HB 116/054-3 designation identifies a button cell, with a maximum diameter of 11,6 mm and a
maximum height of 5,4 mm with three parallel connected cells.
5.2 Cell or battery termination
This standard does not specify cell or battery termination.
5.3 Marking
5.3.1 Small prismatic cells and cylindrical cells
Each jacketed cell supplied without connections shall carry durable markings giving the
following minimum information:
• sealed rechargeable nickel-metal hydride or Ni-MH;
• rated capacity;
• nominal voltage;
• polarity (+ and –);
• date of manufacture (which may be in code);
• name or identification of manufacturer or supplier;
• mark for promoting useful use of cell resources.
NOTE 1 This mark is applied where a recycling programme is available.
NOTE 2 In general, sealed nickel-metal hydride rechargeable single cells with connection tabs need no labels if
they form an integral part of a battery, in which case, the battery itself is marked with the above information.
5.3.2 Button cells
Each button cell supplied without connection shall carry durable markings giving the following
minimum information:
• designation as specified in 5.1;
• polarity (+ and –);
• date of manufacture (which may be in code);
• name or identification of manufacturer or supplier.
5.3.3 Batteries
Each battery shall carry durable markings giving the following minimum information:
• rated capacity;
• nominal voltage;
• date of manufacture (which may be in code).
5.4 Exemption of wording
Each cell or battery shall include minimum information on the label as specified in 5.3.1
to 5.3.3. Therefore, additional information such as safety cautions should be included in the
form of a manual not on the cell or battery label.
Each cell or battery shall include minimum information on the label as specified in 5.3.1 to
5.3.3. Therefore, cells or batteries encased in soft or hard plastic with the safety cautions
printed on the outside should not include caution details on the cell or battery label.
6 Dimensions
6.1 Small prismatic cells and cylindrical cells
6.1.1 General
Figures 1 and 2 show the shape of the cells.
– 14 – IEC 61951-2:2017 © IEC 2017
Diameter Thickness
Width
(+) (+)
(–)
(–)
IEC IEC
Figure 1 – Jacketed cylindrical cells Figure 2 – Jacketed small prismatic cells
6.1.2 Small prismatic cells
Table 1 shows the dimensions for jacketed small prismatic cells.
Table 1 – Dimensions of jacketed small prismatic cells
Cell designation Width Thickness Height
mm mm mm
HF 15/08/49 14,5 7,4 48,2
HF 15/09/49 14,5 8,3 48,2
HF 16/07/34 16,0 6,6 34,0 0
0 –1,0
HF 18/07/36 17,3 6,1 35,7
–0,7
HF 18/07/49 17,3 6,1 48,2
HF 18/09/49 17,3 8,3 48,2
–1,0
HF 18/07/68 17,3 6,1 67,3
HF 18/11/68 17,3 10,7 67,3
HF 18/18/68 17,3 17,3 67,3 0
–1,0
–1,5
HF 23/11/68 22,7 10,7 67,3
HF 23/15/68 22,7 14,5 67,3
6.1.3 Cylindrical cells
6.1.3.1 Cells dimensionally interchangeable with primary cells
Table 2 gives the requirements relative to the dimensions for jacketed cylindrical cells which
are dimensionally interchangeable with primary cells (see Figure 3).
Height
Height
Table 2 – Dimensions of jacketed cylindrical cells
dimensionally interchangeable with primary cells
Dimensions
mm
Type Nominal
Cell Corresponding
designation voltage
a c d
designation primary cell A B C D E F G Φ ΦP
b
(reference) V
Max Min Min – Max Max Min Min Max Min Max
R03
HR03 AAA 44,5 (43,3) 4,3 0,5 3,8 (2,0) 0,8 10,5 9,5 0,4
LR03
R6
HR6 AA 50,5 (49,2) 7,0 0,5 5,5 (4,2) 1,0 14,5 13,5 0,5
LR6
1,2
R14
HR14 C 50,0 (48,6) 13,0 0,9 7,5 (5,5) 1,5 26,2 24,9 1,0
LR14
R20
HR20 D 61,5 (59,5) 18,0 1,0 9,5 (7,8) 1,5 34,2 32,3 1,0
LR20
NOTE Figures in parentheses are reference values.
a
Cell designations shall be in accordance with the nomenclature rules given in IEC 60086-1.
b
In some countries these cell types are also known as AAA (R 03); AA (R 6); C (R 14); D (R 20).
c
Carbon zinc cells (R) and alkaline primary cells (LR) shall be compliant with the provisions of IEC 60086-2, respectively.
d
There is no specification for the value “D” for sealed nickel-metal-hydride cylindrical rechargeable single cells
interchangeable with primary cells.
Optional pip
F
Key
A maximum overall height of the cell
B minimum distance between the flats of the positive and the
negative contacts
C minimum outer diamete
...
IEC 61951-2 ®
Edition 4.1 2022-10
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Secondary sealed cells and batteries for portable applications –
Part 2: Nickel-metal hydride
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Accumulateurs étanches pour applications portables –
Partie 2: Nickel-métal hydrure
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IEC 61951-2 ®
Edition 4.1 2022-10
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Secondary sealed cells and batteries for portable applications –
Part 2: Nickel-metal hydride
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Accumulateurs étanches pour applications portables –
Partie 2: Nickel-métal hydrure
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.30 ISBN 978-2-8322-6002-9
IEC 61951-2 ®
Edition 4.1 2022-10
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Secondary cells and batteries containing alkaline or other non-acid
electrolytes – Secondary sealed cells and batteries for portable applications –
Part 2: Nickel-metal hydride
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –
Accumulateurs étanches pour applications portables –
Partie 2: Nickel-métal hydrure
– 2 – IEC 61951-2:2017+AMD1:2022 CSV
© IEC 2022
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Parameter measurement tolerances . 9
5 Cell and battery designation and marking . 10
5.1 Cell and battery designation . 10
5.1.1 Small prismatic cells and cylindrical cells . 10
5.1.2 Button cells. 11
5.1.3 Batteries . 12
5.2 Cell or battery termination . 12
5.3 Marking . 12
5.3.1 Small prismatic cells and cylindrical cells . 12
5.3.2 Button cells. 13
5.3.3 Batteries . 13
5.4 Exemption of wording. 13
6 Dimensions. 13
6.1 Small prismatic cells and cylindrical cells . 13
6.1.1 General . 13
6.1.2 Small prismatic cells . 14
6.1.3 Cylindrical cells . 14
6.2 Button cells . 17
6.3 9 V type nickel-metal hydride batteries . 18
7 Electrical tests . 19
7.1 General . 19
7.2 Charging procedure for test purposes . 19
7.2.1 Charging procedure for cell. 19
7.2.2 Charging procedure for battery . 19
7.3 Discharge performance . 19
7.3.1 General . 19
7.3.2 Discharge performance at 20 °C . 20
7.3.3 Discharge performance at 0 °C . 21
7.3.4 Discharge performance for rapid charge cells (R cells) . 22
7.4 Charge (capacity) retention . 22
7.5 Endurance . 23
7.5.1 Endurance in cycles. 23
7.5.2 Permanent charge endurance . 26
7.6 Charge acceptance at constant voltage . 29
7.7 Overcharge . 29
7.7.1 Small prismatic, L, M, H, X, LS or MS cylindrical, and button cells . 29
7.7.2 LT/LU, MT/MU or HT/HU cylindrical cells . 30
7.7.3 J cylindrical cells . 30
7.7.4 JT cylindrical cells . 30
7.7.5 R cylindrical cells . 31
7.8 Safety device operation Pressure relief feature . 31
7.9 Surface temperature limitation device operation (for S cell only) . 31
© IEC 2022
7.10 Storage . 32
7.10.1 Button cells or batteries, small prismatic cells or batteries, cylindrical
cells or batteries . 32
7.10.2 Button cells or batteries, small prismatic cells or batteries, cylindrical
cells or batteries (high recovery type) . 33
7.11 Charge acceptance at +55 °C for LT, MT or HT cylindrical cells . 34
7.12 Trickle charge acceptance for JT cylindrical cells . 35
7.13 Internal resistance . 35
7.13.1 General . 35
7.13.2 Measurement of the internal AC resistance . 36
7.13.3 Measurement of the internal DC resistance . 36
8 Mechanical tests . 37
9 Safety requirements . 37
10 Type approval and batch acceptance . 37
10.1 General . 37
10.2 Type approval . 37
10.2.1 Type approval for small prismatic cells and button cells . 37
10.2.2 Type approval for cylindrical cells . 41
10.2.3 Type approval for batteries . 43
10.3 Batch acceptance . 44
Bibliography . 46
Figure 1 – Jacketed cylindrical cells . 14
Figure 2 – Jacketed small prismatic cells . 14
Figure 3 – Jacketed cells dimensionally interchangeable with primary cells . 15
Figure 4 – Button cells . 18
Figure 5 – 9 V type nickel-metal hydride batteries . 18
Table 1 – Dimensions of jacketed small prismatic cells . 14
Table 2 – Dimensions of jacketed cylindrical cells dimensionally interchangeable with
primary cells . 15
Table 3 – Dimensions of jacketed cylindrical cells not dimensionally interchangeable
with primary cells . 16
Table 4 – Dimensions of button cells. 18
Table 5 – Dimensions of 9 V type nickel-metal hydride batteries . 19
Table 6 – Discharge performance at 20 °C for small prismatic cells and cylindrical cells . 20
Table 7 – Discharge performance at 20 °C for button cells . 20
Table 8 – Discharge performance at 20 °C for batteries . 21
Table 9 – Rated capacity (mAh) compliance test (example) . 21
Table 10 – Discharge performance at 0 °C for small prismatic cells and cylindrical cells . 22
Table 11 – Discharge performance at 0 °C for button cells . 22
Table 12 – Endurance in cycles for small prismatic, button and cylindrical cells not
dimensionally interchangeable with primary cells . 23
Table 13 – Endurance in cycles for H or X cells . 24
Table 14 – Endurance in cycles for X cells . 24
Table 15 – Endurance in cycles for HR or XR cells . 25
– 4 – IEC 61951-2:2017+AMD1:2022 CSV
© IEC 2022
Table 16 – Endurance in cycles for cylindrical cells dimensionally interchangeable with
primary cells . 25
Table 17 – Permanent charge endurance for L, M, J, H or X cells . 26
Table 18 – Permanent charge endurance for LT, MT or HT cells . 27
Table 19 – Permanent charge endurance for LU, MU or HU cells . 29
Table 20 – Overcharge at 0 °C . 30
Table 21 – Capacity deterioration due to storage period for cells or batteries . 33
Table 22 – Capacity deterioration due to storage period for cells or batteries (high
recovery type) . 34
Table 23 – Charge and discharge at +55 °C . 35
Table 24 – Trickle charge acceptance for JT cylindrical cells . 35
Table 25 – Constant discharge currents used for measurement of DC resistance . 37
Table 26 – Sequence of tests for type approval for small prismatic cells . 38
Table 27 – Sequence of tests for type approval for small prismatic cells (high recovery
type) . 39
Table 28 – Sequence of tests for type approval for button cells . 40
Table 29 – Sequence of tests for type approval for button cells (high recovery type) . 41
Table 30 – Sequence of tests for type approval for cylindrical cells . 42
Table 31 – Sequence of tests for type approval for cylindrical cells (high recovery
type) . 43
Table 32 – Sequence of tests for type approval for batteries . 44
Table 33 – Sequence of tests for type approval for batteries (high recovery type) . 44
Table 34 – Recommended test sequence for batch acceptance . 45
© IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
SECONDARY SEALED CELLS AND BATTERIES
FOR PORTABLE APPLICATIONS –
Part 2: Nickel-metal hydride
FOREWORD
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This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 61951-2 edition 4.1 contains the fourth edition (2017-03) [documents 21A/623/
FDIS and 21A/629/RVD] and its amendment 1 (2022-10) [documents 21A/809/FDIS
and 21A/816/RVD].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this
publication.
– 6 – IEC 61951-2:2017+AMD1:2022 CSV
© IEC 2022
International Standard IEC 61951-2 has been prepared by subcommittee 21A: Secondary
cells and batteries containing alkaline or other non-acid electrolytes, of IEC technical
committee 21: Secondary cells and batteries.
This fourth edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• addition of battery type;
• addition of ‘F’ (high recovery type) designation for cells and batteries;
• addition of ‘I’ (low self-discharge type) designation for cells;
• revision of Figure 3 (6.1.3.1);
• addition of “optional pip” note to positive contact;
• changed leader line position from pip to flats of positive contact (B and G).
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61951 series can be found, under the general title Secondary cells
and batteries containing alkaline or other non-acid electrolytes – Secondary sealed cells and
batteries for portable applications, on the IEC website.
The committee has decided that the contents of the base publication and its amendment will
remain unchanged until the stability date indicated on the IEC web site under webstore.iec.ch
in the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
© IEC 2022
SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
SECONDARY SEALED CELLS AND BATTERIES
FOR PORTABLE APPLICATIONS –
Part 2: Nickel-metal hydride
1 Scope
This part of IEC 61951 specifies marking, designation, dimensions, tests and requirements for
secondary sealed nickel-metal hydride small prismatic, cylindrical and button cells and
batteries, suitable for use in any orientation, for portable applications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60050-482:2004, International Electrotechnical Vocabulary (IEV) – Part 482: Primary and
secondary cells and batteries
IEC 60086-1, Primary batteries – Part 1: General
IEC 60086-2, Primary batteries – Part 2: Physical and electrical specifications
IEC 61959, Secondary cells and batteries containing alkaline or other non-acid electrolytes –
Mechanical tests for sealed portable secondary cells and batteries
IEC 62133-1, Secondary cells and batteries containing alkaline or other non-acid electrolytes
– Safety requirements for portable sealed secondary cells and for batteries made from them,
for use in portable applications – Part 1: Nickel systems
IEC 62902, Secondary cells and batteries – Marking symbols for identification of their
chemistry
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-482 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
nominal voltage
suitable approximate value of the voltage used to designate or identify a cell or a battery
– 8 – IEC 61951-2:2017+AMD1:2022 CSV
© IEC 2022
Note 1 to entry: The nominal voltage of a sealed nickel-metal hydride rechargeable single cell is 1,2 V.
Note 2 to entry: The nominal voltage of a battery of n series connected cells is equal to n times the nominal
voltage of a single cell.
[SOURCE: IEC 60050-482:2004, 482-03-31, modified – Addition of Notes 1 and 2 to entry.]
3.2
rated capacity
capacity value of a cell or battery determined under specified conditions and declared by the
manufacturer
Note 1 to entry: The rated capacity is the quantity of electricity C Ah (ampere-hours) declared by the
manufacturer which a single cell can deliver during a 5 h period when charging, storing and discharging under the
conditions specified in 7.3.2.
Note 2 to entry: The capacity of a battery is the quantity of electricity C Ah (ampere-hours) declared by the
manufacturer which a battery can deliver during a 5 h period, when charged, stored and discharged under the
procedure described in 7.3.2.
[SOURCE: IEC 60050-482:2004, 482-03-15, modified – Addition of Notes 1 and 2 to entry.]
3.3
small prismatic cell
cell in the form of a rectangular parallelepiped whose width and thickness dimensions are not
more than 25 mm
3.4
cylindrical cell
cell of circular cross-section in which the overall height is equal to, or greater than the overall
diameter
3.5
button cell
cell of circular cross-section in which the overall height is less than the overall diameter
3.6
nickel-metal hydride cell
cell containing a nickel hydroxide compound for the positive electrode, a hydrogen absorbing
alloy for the negative electrode, and potassium hydroxide or other alkaline solution as
electrolyte
Note 1 to entry: Positive electrodes are isolated from negative electrodes by a separator
3.7
nickel-metal hydride battery
assembly of secondary cell(s) as a source of electrical energy characterized by its voltage,
size, terminal arrangement, capacity and rate capability
3.8
sealed cell
cell which remains closed and does not release either gas or liquid when operated within the
limits of charge and temperature specified by the manufacturer
Note 1 to entry: The cell is equipped with a safety device to prevent dangerously high internal pressure.
Note 2 to entry: The cell does not require addition to the electrolyte and is designed to operate during its life in its
original sealed state.
Note 3 to entry: The nickel-metal hydride cell, however, may release gas towards the end of its life due to the
accumulation of hydrogen in the cell.
© IEC 2022
[SOURCE: IEC 60050-482:2004, 482-05-17, modified – The existing note has been developed
into Notes 1, 2 and 3 to entry.]
3.9
portable cell
cell designed mainly for use in an easily hand-carried battery
3.10
battery for portable applications
battery for use in device or appliance which is conveniently hand-carried
3.11
surface temperature limited cell
cell which performs a function that prevents the temperature increase from a certain standard
point even at the moment of an abnormal occurrence such as short circuit of cell
3.12
high recovery type cell or battery
cell or battery which has lower “permanent capacity loss” than normal type after storage
Note 1 to entry: It is defined as “high recovery type” in 7.10.2, Table 22.
3.13
low self-discharge type cell
cell which is able to retain higher charge capacity than normal type after storage by reducing
self-discharge
Note 1 to entry: It is defined as “low self-discharge type” in 7.4.
3.14
9 V type nickel-metal hydride battery
nickel-metal hydride battery which is interchangeable with 9 V primary batteries and is
composed of cylindrical cells, small prismatic cells or button cells
3.15
trickle charge
charge method by supplying a small electrical current to the cell while disconnecting the cell
from load to supplement self-discharge of the cell
4 Parameter measurement tolerances
The overall accuracy of controlled or measured values, relative to the specified or actual
values, shall be within the following tolerances:
a) ±1 % for voltage;
b) ±1 % for current;
c) ±1 % for capacity;
d) ±2 °C for temperature;
e) ±0,1 % for time;
f) ±0,1 mm for dimensions;
g) ±5 % for humidity.
These tolerances comprise the combined accuracy of the measuring instruments, the
measurement techniques used and all other sources of error in the test procedure.
The details of the instrumentation used shall be provided in each report of results.
– 10 – IEC 61951-2:2017+AMD1:2022 CSV
© IEC 2022
5 Cell and battery designation and marking
5.1 Cell and battery designation
5.1.1 Small prismatic cells and cylindrical cells
5.1.1.1 General
Sealed nickel-metal hydride small prismatic rechargeable single cells and cylindrical
rechargeable single cells shall be designated by a letter L, M, J, H or X which signifies:
• low rate of discharge (L);
• medium rate of discharge (M);
• medium high rate of discharge (J);
• high rate of discharge (H);
• very high rate of discharge (X).
NOTE 1 These cells are typically but not exclusively used for the following discharge rates:
• L up to 0,5 I A;
t
• M up to 3,5 I A;
t
• J up to 5,0 I A;
t
• H up to 7,0 I A;
t
• X up to and above 7,0 I A.
t
NOTE 2 These currents are expressed as multiples of I A, where I A = C Ah/1 h (see IEC 61434).
t t 5
When a cell is intended for permanent charge at elevated temperatures, typically higher than
40 °C, a letter "T" is placed after the letter L, M, J, H or X.
When a cell is intended for permanent charge at elevated temperatures, typically higher than
50 °C, a letter "U" is placed after the letter L, M, J, H or X.
When a cell is intended for surface temperature limitation, a letter “S” is placed after the
letter L or M.
When a cell is intended for rapid charge, typically at 1,0 I A, a letter "R" is placed after the
t
letter L, M, J, H or X.
When a cell or battery is intended as a high recovery type, a letter “F” is placed after the letter
L, M, J, H or X.
When a cell is intended as a low self-discharge cell, a letter “I” is placed after the
letter L, M, J, H or X.
5.1.1.2 Small prismatic cells
Sealed nickel-metal hydride small prismatic rechargeable single cells shall be designated by
the letters "HF" followed by a letter L, M, J, H or X followed by letter F, followed by, if
designated, letter I, followed by three groups of figures, each group being separated by a
solidus, as follows:
a) The two figures to the left of the first solidus shall indicate the maximum width specified
for the cell, expressed in millimetres, rounded up to the next whole number.
b) The two figures in the middle shall indicate the maximum thickness specified for the cell,
expressed in millimetres, rounded up to the next whole number.
© IEC 2022
c) The two figures to the right of the second solidus shall indicate the maximum height
specified for the cell, expressed in millimetres, rounded up to the next whole number.
EXAMPLE HFLF 18/07/49 designation identifies a small prismatic cell of low discharge rate capability, high
recovery type with a maximum width of 18 mm, a maximum thickness of 7 mm and a maximum height of 49 mm.
5.1.1.3 Cylindrical cells
Sealed nickel-metal hydride cylindrical rechargeable single cells shall be designated by the
letters "HR" followed by a letter L, M, J, H or X followed by letter F, followed by, if designated,
letter I, followed by two groups of figures, each group being separated by a solidus, as
follows:
a) The two figures to the left of the solidus shall indicate the maximum diameter specified for
the cell, expressed in millimetres, rounded up to the next whole number.
b) The two figures to the right of the solidus shall indicate the maximum height specified for
the cell, expressed in millimetres, rounded up to the next whole number.
When a manufacturer designs a cell with dimensions and tolerances which make it
interchangeable with a primary cell, the designation of Table 2 shall also be marked on the
cell.
EXAMPLE 1 HRLF 33/62 designation identifies a cylindrical cell of low discharge rate capability, high recovery
type with a maximum diameter of 33 mm and a maximum height of 61,5 mm.
EXAMPLE 2 HRLTF 33/62 designation identifies a cylindrical cell of low discharge rate capability, intended for
permanent charge at elevated temperatures, high recovery type, with a maximum diameter of 33 mm and a
maximum height of 61,5 mm.
EXAMPLE 3 HRXRFI 23/43 designation identifies a cylindrical cell of very high discharge rate capability, intended
for rapid charge, high recovery type, low self-discharge type with a maximum diameter of 23 mm and a maximum
height of 43 mm.
For cells dimensionally interchangeable with primary cells, the following single or double
figures following the letter F or I may indicate:
• 20- Size D;
• 14- Size C;
• 6- Size AA;
• 03- Size AAA.
NOTE Cells dimensionally interchangeable with primary cells correspond to M type unless otherwise specified
For the purpose of this explanation, an example is given below.
EXAMPLE 4 HRMRFI03 designation identifies a sealed nickel-metal hydride cylindrical rechargeable single cell,
of medium discharge rate capability, also intended for rapid charge, high recovery type and low self-discharge
type, dimensionally interchangeable with primary cell and whose type designation is AAA.
5.1.2 Button cells
Sealed nickel-metal hydride button rechargeable single cells shall be designated by the letters
"HB" followed by letter F, followed by, if designated, letter I, followed by two groups of figures,
each group being separated by a solidus, as follows:
a) The three figures to the left of the solidus shall indicate the maximum diameter specified
for the cell, expressed in tenths of millimetres, rounded up to the next whole number.
b) The three figures to the right of the solidus shall indicate the maximum height specified for
the cell, expressed in tenths of millimetres, rounded up to the next whole number.
EXAMPLE HBFI 116/054 designation identifies a button cell, intended as a high recovery type, low self-discharge
type, with a maximum diameter of 11,6 mm and a maximum height of 5,4 mm.
– 12 – IEC 61951-2:2017+AMD1:2022 CSV
© IEC 2022
5.1.3 Batteries
Sealed nickel-metal hydride rechargeable batteries shall be designated with the following
form:
N1 single cell designation – N2
where
N1 is the number of series connected cells in the battery;
N2 is the number of parallel connected cells if 2 or greater (not shown if value is 1).
Sealed nickel-metal hydride battery designation will be identified based on single cells within
the series and not the battery as a whole.
• Small prismatic cells in battery
EXAMPLE 1 2HFLF 18/07/49 designation identifies a small prismatic cell of low discharge rate capability,
high recovery type with a maximum width of 18 mm, a maximum thickness of 7 mm and a maximum height of
49 mm with two series connected cells.
• Cylindrical cells in battery
EXAMPLE 2 3HRLF 33/62 designation identifies a cylindrical cell of low discharge rate capability, high
recovery type with a maximum diameter of 33 mm and a maximum height of 61,5 mm with three series
connected cells.
EXAMPLE 3 4HRLTF 33/62 designation identifies a cylindrical cell of low discharge rate capability, intended
for permanent charge at elevated temperatures, high recovery type, with a maximum diameter of 33 mm and a
maximum height of 61,5 mm with four series connected cells.
EXAMPLE 4 HRXRFI 23/43 -2 designation identifies a cylindrical cell of very high discharge rate capability,
intended for rapid charge, high recovery type, low self-discharge type with a maximum diameter of 23 mm and
a maximum height of 43 mm with two parallel connected cells.
• Cells interchangeable with primary cells in batteries
EXAMPLE 5 HRMRFI03-3 designation identifies a sealed nickel-metal hydride cylindrical rechargeable single
cell, of medium discharge rate capability, also intended for rapid charge, high recovery type and low self-
discharge type, dimensionally interchangeable with primary cell whose type designation is AAA with three
parallel connected cells.
• Button cells in battery
EXAMPLE 6 HB 116/054-3 designation identifies a button cell, with a maximum diameter of 11,6 mm and a
maximum height of 5,4 mm with three parallel connected cells.
5.2 Cell or battery termination
This standard does not specify cell or battery termination.
5.3 Marking
5.3.1 Small prismatic cells and cylindrical cells
Each jacketed cell supplied without connections shall carry durable markings giving the
following minimum information:
• sealed rechargeable nickel-metal hydride or Ni-MH;
• rated capacity;
• nominal voltage;
• polarity (+ and –);
• date of manufacture (which may be in code);
• name, or identification or registered trademark of manufacturer or supplier;
• mark for promoting useful use of cell resources.
NOTE 1 This mark is applied where a recycling programme is available.
© IEC 2022
NOTE 2 In general, sealed nickel-metal hydride rechargeable single cells with connection tabs need no labels if
they form an integral part of a battery, in which case, the battery itself is marked with the above information.
5.3.2 Button cells
Each button cell supplied without connection shall carry durable markings giving the following
minimum information:
• designation as specified in 5.1;
• polarity (+ and –);
• date of manufacture (which may be in code);
• name, or identification or registered trademark of manufacturer or supplier.
5.3.3 Batteries
Each battery shall carry durable markings giving the following minimum information:
• rated capacity;
• nominal voltage;
• date of manufacture (which may be in code);
• marking symbols (identification of the chemistry according to IEC 62902).
5.4 Exemption of wording
Each cell or battery shall include minimum information on the label as specified in 5.3.1
to 5.3.3. Therefore, additional information such as safety cautions should be included in the
form of a manual not on the cell or battery label.
Each cell or battery shall include minimum information on the label as specified in 5.3.1 to
5.3.3. Therefore, cells or batteries encased in soft or hard plastic with the safety cautions
printed on the outside should not include caution details on the cell or battery label.
6 Dimensions
6.1 Small prismatic cells and cylindrical cells
6.1.1 General
Figures 1 and 2 show the shape of the cells.
– 14 – IEC 61951-2:2017+AMD1:2022 CSV
© IEC 2022
Thickness
Diameter
Width
(+) (+)
(–)
(–)
IEC IEC
Figure 1 – Jacketed cylindrical cells Figure 2 – Jacketed small prismatic cells
6.1.2 Small prismatic cells
Table 1 shows the dimensions for jacketed small prismatic cells.
Table 1 – Dimensions of jacketed small prismatic cells
Cell designation Width Thickness Height
mm mm mm
HF 15/08/49 14,5 7,4 48,2
HF 15/09/49 14,5 8,3 48,2
HF 16/07/34 16,0 6,6 34,0 0
0 –1,0
HF 18/07/36 17,3 6,1 35,7
–0,7
HF 18/07/49 17,3 6,1 48,2
HF 18/09/49 17,3 8,3 48,2
–1,0
HF 18/07/68 17,3 6,1 67,3
HF 18/11/68 17,3 10,7 67,3
HF 18/18/68 17,3 17,3 67,3 0
–1,0
–1,5
HF 23/11/68 22,7 10,7 67,3
HF 23/15/68 22,7 14,5 67,3
6.1.3 Cylindrical cells
6.1.3.1 Cells dimensionally interchangeable with primary cells
Table 2 gives the requirements relative to the dimensions for jacketed cylindrical cells which
are dimensionally interchangeable with primary cells (see Figure 3).
Height
Height
© IEC 2022
Table 2 – Dimensions of jacketed cylindrical cells
dimensionally interchangeable with primary cells
Dimensions
mm
Type Nominal
Cell Corresponding
designation voltage
a c d
designation primary cell A B C D E F G Φ ΦP
b
(reference) V
Max Min Min – Max Max Min Min Max Min Max
R03
HR03 AAA 44,5 (43,3) 4,3 0,5 3,8 (2,0) 0,
...
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