IEC 61951-1:2017/AMD1:2023

IEC 61951-1 ®
Edition 4.0 2023-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Secondary cells and batteries containing alkaline or other non-acid electrolytes
– Secondary sealed cells and batteries for portable applications –
Part 1: Nickel-cadmium
Accumulateurs alcalins et autres accumulateurs à électrolyte non-acide –
Accumulateurs étanches pour applications portables –
Partie 1: Nickel-cadmium
IEC 61951-1:2017-03/AMD1:2023-02(en-fr)

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IEC 61951-1 ®
Edition 4.0 2023-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Secondary cells and batteries containing alkaline or other non-acid electrolytes

– Secondary sealed cells and batteries for portable applications –

Part 1: Nickel-cadmium
Accumulateurs alcalins et autres accumulateurs à électrolyte non-acide –

Accumulateurs étanches pour applications portables –

Partie 1: Nickel-cadmium
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.30 ISBN 978-2-8322-6354-9

– 2 – IEC 61951-1:2017/AMD1:2023
© IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
SECONDARY SEALED CELLS AND BATTERIES
FOR PORTABLE APPLICATIONS –
Part 1: Nickel-cadmium
AMENDMENT 1
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 this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
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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 document may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 61951-1:2017 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.
The text of this Amendment is based on the following documents:
Draft Report on voting
21A/821/FDIS 21A/828/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
© IEC 2023
The language used for the development of this Amendment is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications/.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
___________
2 Normative references
Add, at the end of the existing list, IEC 62902 to the list of normative references, as follows:
IEC 62902, Secondary cells and batteries – Marking symbols for identification of their chemistry
3 Terms and definitions
Add the following term and definition for "trickle charge":
3.11
trickle charge
method of charge applied to a battery wherein the state of charge is maintained by a continuous,
long term, regulated small electric current
Note 1 to entry: The trickle charge compensates self-discharge effects and maintains the battery in an
approximately fully charged state.
5.3.1 Small prismatic cells and cylindrical cells
Replace, in the sixth bullet point, "name or identification" with "name, identification or registered
trademark" as follows:
• name, identification, or registered trademark of manufacturer or supplier;
5.3.2 Button cells
Replace, in the fourth bullet point, "name or identification" with "name, identification or
registered trademark" as follows:
• name, identification, or registered trademark of manufacturer or supplier.
5.3.3 Batteries
Add a fifth bullet point at the end of the existing bulleted list as follows:
• marking symbols (identification of the chemistry according to IEC 62902).

– 4 – IEC 61951-1:2017/AMD1:2023
© IEC 2023
Table 5 – Discharge performance at 20 °C for small prismatic cells and cylindrical cells
Replace the existing title to Table 5 with the following new title:
Table 5 – Discharge performance at 20 °C for small prismatic cells
Add, after Table 5, the following new Table 32:
Table 32 – Discharge performance at 20 °C for
cylindrical cells
Discharge conditions Minimum discharge duration
h/min
Rate of Final voltage Cell designation
constant
current
L/LT/LU/LS M/MT/MU J JT H/HT/HU X
A V
a
1,0 5 h 5 h 5 h 5 h 5 h 5 h
0,2 I
t
1,0 I 0,9 – 42 min 48 min 43 min 48 min 54 min
t
b
0,8 – – – – 6 min 9 min
5,0 I
t
b
0,7 – – – – – 4 min
10,0 I
t
a
Five cycles are permitted per cell for this test. The test shall be terminated at the end of the first cycle of each
cell which meets the requirement.
b
Prior to the 5 I A and 10 I A tests, a conditioning cycle may be included if necessary. This cycle shall consist
t t
of charging at 0,1 I A in accordance with 7.2 and discharging at 0,2 I A in an ambient temperature of
t t
20 °C ± 5 °C according to 7.3.2.

7.5.1.3 Cylindrical cells dimensionally interchangeable with primary cells
Replace the bulleted item at the end of the subclause with the following:
• 200 for KR03, KR6, KR14 and KR20 cells.
7.8 Safety device operation
Replace the existing title to 7.8 with the following:
7.8 Pressure relief feature
Replace the first paragraph after the warning statement with the following paragraph:
The following test shall be carried out in order to establish that the pressure relief feature of the
cell will operate to allow the escape of gas when the internal pressure exceeds a critical value.
7.12 Internal resistance
7.12.1 General
Add, after the second paragraph, the following paragraph:
There is no requirement for internal resistance, but when the value is requested, measurement
is performed according to the method described in this document.

© IEC 2023
7.12.2 Measurement of the internal AC resistance
Replace the first sentence with the following:
The alternating root mean square voltage, U , shall be measured when applying to the cell an
a
alternating root mean square current, I , at the frequency of 1,0 kHz ± 0,1 kHz for a period of
a
1 s to 5 s.
Replace the introductory sentence to the formula, the formula itself, and the l
...