prEN IEC 63115-1:2026

SLOVENSKI STANDARD
01-marec-2026
Sekundarni členi in baterije z alkalnimi ali drugimi nekislinskimi elektroliti -
Zatesnjeni nikelj-kovinski hidridni členi in baterije za industrijsko uporabo - 1. del:
Zmogljivost
Secondary cells and batteries containing alkaline or other non-acid electrolytes - Sealed
nickel-metal hydride cells and batteries for use in industrial applications - Part 1:
Performance
Sekundärzellen und -batterien mit alkalischen oder anderen nicht-säurehaltigen
Elektrolyten - Gasdichte Nickel-Metallhydrid-Zellen und -Batterien für den Gebrauch in
industriellen Anwendungen - Teil 1: Leistungsfähigkeit
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide - Accumulateurs
étanches au nickel-métal hydrure destinés à l'utilisation dans des applications
industrielles - Partie 1: Performances
Ta slovenski standard je istoveten z: prEN IEC 63115-1:2026
ICS:
29.220.30 Alkalni sekundarni členi in Alkaline secondary cells and
baterije batteries
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

21A/962/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63115-1 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-01-30 2026-04-24
SUPERSEDES DOCUMENTS:
21A/923/CD, 21A/952A/CC
IEC SC 21A : SECONDARY CELLS AND BATTERIES CONTAINING ALKALINE OR OTHER NON-ACID ELECTROLYTES
SECRETARIAT: SECRETARY:
France Mr Jean-Marie Bodet
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

TC 9
ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
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Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is
the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Secondary cells and batteries containing alkaline or other non-acid electrolytes - Sealed
nickel-metal hydride cells and batteries for use in industrial applications - Part 1: Performance

PROPOSED STABILITY DATE: 2027
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IEC CDV 63115-1 © IEC 2026
CONTENTS
Contact . 3
CONTENTS . 4
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 9
4 Parameter measurement tolerances . 11
5 Marking and designation . 12
5.1 Marking . 12
5.2 Cell and monobloc designation . 12
5.3 Module, battery pack and battery system designation . 13
6 Dimensions . 14
6.1 Cylindrical cell . 14
6.2 Prismatic cell and monobloc . 14
6.3 Module, battery pack and battery system . 15
7 Electrical tests . 15
7.1 General . 15
7.2 Charging procedure for test purposes . 16
7.2.1 Charging procedure for cells, monoblocs and batteries . 16
7.2.2 Charging procedure for monoblocs and batteries (not designed
overcharge usage) . 16
7.3 Discharge performance . 16
7.3.1 Discharge performance at 20 °C . 16
7.3.2 Discharge performance at 5 °C . 17
7.3.3 Discharge performance at −18 °C . 18
7.4 Charge (capacity) retention and recovery . 18
7.4.1 General . 18
7.4.2 Test method . 19
7.4.3 Acceptance criterion . 19
7.5 Endurance in cycles . 19
7.5.1 Endurance test for cells, monoblocs and batteries . 19
7.5.2 Endurance test for monoblocs and batteries (not designed overcharge
usage) . 20
7.5.3 Endurance test for rapid charge and high rate discharge . 21
7.6 Internal resistance . 21
7.6.1 General . 21
7.6.2 Measurement of the internal AC resistance . 22
7.6.3 Measurement of the internal DC resistance . 22
7.7 Storage . 23
8 Type test conditions . 23
8.1 General . 23
8.2 Sample size . 23
8.3 Conditions for type approval . 25
8.3.1 Dimensions . 25
8.3.2 Electrical tests . 26
IEC CDV 63115-1 © IEC 2026
Annex A (informative) Battery structure information . 27
A.1 Example 1 . 27
A.2 Example 2 . 27
A.3 Example 3 . 27
A.4 Example 4 . 28
A.5 Example 5 . 28
A.6 Example 6 . 28
A.7 Example 7 . 29
A.8 Example 8 . 29
A.9 Example 9 . 30
Bibliography . 31

Figure 1 – Examples of maximum dimensions of a cylindrical cell . 14
Figure 2 – Examples of maximum dimensions of a prismatic cell and monobloc . 15
Figure 3 – Test sequence . 25
Figure A.1 – Structure 3S . 27
Figure A.2 – Structure 2P . 27
Figure A.3 – Structure 3S2P . 27
Figure A.4 – Structure 2P4S . 28
Figure A.5 – Structure 2P4S3P . 28
Figure A.6 – Structure (2P4S)3P . 29
Figure A.7 – Structure (3S2P)3P . 29
Figure A.8 – Structure (5S)4S . 30
Figure A.9 – Structure ((3S2P)3P)2S . 30

Table 1 – Marking per item type . 12
Table 2 – Discharge performance at 20 °C ± 5 °C . 17
Table 3 – Discharge performance at 5 °C ± 5 °C . 17
Table 4 – Discharge performance at −18 °C ± 5 °C . 18
Table 5 – Endurance test in cycles . 19
Table 6 – Endurance test in cycles for monoblocs and batteries (not designed
overcharge usage) . 20
Table 7 – Endurance test in cycles for rapid charge and high rate discharge . 21
Table 8 – Discharge current applied during the measurement of the internal DC
resistance . 23
Table 9 – Sample size for type tests . 24

IEC CDV 63115-1 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Secondary cells and batteries containing alkaline or other non-acid
electrolytes - Sealed nickel-metal hydride cells and batteries for use in
industrial applications -
Part 1: Performance
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 corres ponding 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 other damage of any nature whatsoever, whether direct
or indirect, or for costs (including legal fees) and expenses arising out of the publication, use
of, or reliance upon, this IEC Publication or any other IEC 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) IEC draws attention to the possibility that the implementation of this document may involve
the use of (a) patent(s). IEC takes no position concerning the evidence, validity or applicability
IEC CDV 63115-1 © IEC 2026
of any claimed patent rights in respect thereof. As of the date of publication of this document,
IEC [had/had not] received notice of (a) patent(s), which may be required to implement this
document. However, implementers are cautioned that this may not represent the latest
information, which may be obtained from the patent database available at https://patents.iec.ch.
IEC shall not be held responsible for identifying any or all such patent rights.
IEC 63115-1 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. It is an International Standard.
This second edition cancels and replaces the first edition published 2020 and its amendment 1
published in 2022. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of charging procedure for monoblocs and batteries (not designed overcharge
usage);
b) addition of endurance test for monoblocs and batteries (not designed overcharge usage);
c) addition of endurance test for rapid charge and high rate discharge;
d) revision of criteria for storage (7.7).
The text of this International Standard is based on the following documents:
Draft Report on voting
21A/XX/FDIS 21A/XX/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English [change
language if necessary].
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.
A list of all parts in the IEC 63115, published under the general title Secondary cells and
batteries containing alkaline or other non-acid electrolytes - Sealed nickel-metal hydride cells
and batteries for use in industrial applications, can be found on the IEC website.
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, or
– revised.
IEC CDV 63115-1 © IEC 2026
INTRODUCTION
Note from IEC: The following items were listed in the bibliography but not cited in the text.
Please find a suitable place to cite them to justify their inclusion in the bibliography:
IEC 60051 (all parts), Direct acting indicating analogue electrical measuring instruments and
their accessoriesIEC 60051 (all parts) [1]
IEC 60410, Sampling plans and procedures for inspection by attributesIEC 60410 [2]
IEC 60485, Digital electronic d.c. voltmeters and d.c. electronic analogue-to-digital
convertorsIEC 60485 [3]
IEC TR 61438:1996, Possible safety and health hazards in the use of alkaline secondary cells
and batteries - Guide to equipment manufacturers and usersIEC TR 61438:1996 [4]
IEC 63115-2, Secondary cells and batteries containing alkaline or other non-acid electrolytes -
Sealed nickel-metal hydride rechargeable cells and batteries for use in industrial applications -
Part 2: SafetyIEC 63115-2 [5]
___________
This publication has been withdrawn.
This publication has been withdrawn.
Under preparation.
IEC CDV 63115-1 © IEC 2026
1 Scope
This document specifies the marking, designation, tests and requirements for sealed nickel -
metal hydride cells and batteries used in industrial applications, including stationary
applications.
When an IEC International Standard specifying test conditions and requirements for cells used
in special applications is in conflict with this document, the former takes precedence (e.g. IEC
62675:2014).
The following are some examples of applications that utilize the cells and batteries falling under
the scope of this document.
– Stationary applications: telecom, uninterruptible power supplies (UPS), electrical energy
storage system, utility switching, emergency power and similar applications.
– Motive applications: fork-lift truck, golf cart, AGV (Automatic Guided Vehicle), railway, and
marine, excluding road vehicles.
Since this document covers batteries for various industrial applications, it includes those
requirements that are common and minimum to the various applications.
This document applies to cells and batteries. If the battery is divided into smaller units, the
smaller unit can be tested as representative of the battery. The manufacturer clearly declares
the tested unit. The manufacturer can add functions to the tested unit that are present in the
final battery.
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 61434:1996, Secondary cells and batteries containing alkaline or other non-acid
electrolytes - Guide to the designation of current in alkaline secondary cell and battery
standards
IEC 62675:2014, Secondary cells and batteries containing alkaline or other non-acid
electrolytes - Sealed nickel-metal hydride prismatic rechargeable single cells
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-482:2004 [6],
ISO/IEC Guide 51 [7] and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1
cell
basic functional unit, consisting of an assembly of electrodes, electrolyte, container, terminals
and separators, that is a source of electric energy obtained by direct conversion of chemical
energy
IEC CDV 63115-1 © IEC 2026
[SOURCE: IEC 60050-482:2004 [6], 482-01-01, modified - In the definition, "usually separators"
has been replaced with "separators".]
3.2
sealed 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, and not releasing either gas or liquid when operated within the limits specified by
the manufacturer
Note 1 to entry: A sealed cell can be equipped with a safety device to prevent a dangerously high internal pressure
and is designed to operate during its life in its original sealed state. See IEC 60050-482:2004 [6], 482-05-17.
3.3
monobloc
battery with multiple separate but electrically connected cell compartments each of which is
designed to house an assembly of electrodes, electrolyte, terminals or interconnections and
possible separators
[SOURCE: IEC 60050-482:2004 [6], 482-02-17, modified - "battery" has been omitted from the
term and the note to entry deleted.]
3.4
module
group of cells connected together either in series and/or parallel configuration with
or without protective devices (e.g. fuse or PTC) and monitoring circuitry
3.5
battery pack
energy storage device comprised of one or more cells, monoblocs or modules electrically
connected
Note 1 to entry: A battery pack can have a monitoring circuitry which provides information (e.g. cell voltage) to a
battery system.
3.6
battery system
battery
system which comprises one or more cells, cell blocks, monoblocs, modules or battery packs
Note 1 to entry: The battery system has a battery management system to cut off current in case of overcharge,
overcurrent, overdischarge, or overheating.
Note 2 to entry: Overdischarge cut off is not mandatory if there is an agreement on this between the cell or battery
manufacturer and the customer.
Note 3 to entry: The battery system can have cooling or heating units.
Note 4 to entry: The battery system can be enclosed in a battery box.
3.7
battery management system
BMS
electronic system associated with a battery which has functions to cut off in case of overcharge,
overcurrent, overdischarge, or overheating
Note 1 to entry: The BMS monitors and/or manages its state, calculates secondary data, reports that data and/or
controls its environment to influence the battery's safety, performance and/or service life.
Note 2 to entry: The BMS is sometimes also referred to as a BMU (battery management unit).
Note 3 to entry: This note applies to the French language only.
IEC CDV 63115-1 © IEC 2026
3.8
final voltage
specified voltage of a battery at which the battery discharge is terminated
[SOURCE: IEC 60050-482:2004 [6], 482-03-30, modified - The synonyms "end-of-discharge
voltage", "cut-off voltage" and "end-point voltage" have been omitted.]
3.9
nominal voltage
suitable approximate value of the voltage used to designate or identify the voltage of a cell or
battery
Note 1 to entry: The nominal voltage of a sealed nickel-metal hydride 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 [6], 482-03-31, modified - The words "the voltage of" have
been added; the notes to entry have been added and the reference to electrochemical systems
has been omitted.]
3.10
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 cell or battery can deliver during a 5 h period when charging, storing and discharging under the conditions
specified in 7.3.1.
[SOURCE: IEC 60050-482:2004 [6], 482-03-15, modified - "cell" has been added to the
definition, along with a note to entry.]
3.11
reference test current
I
t
charge or discharge current, expressed as a multiple of I A, where 𝐼 A=𝐶 Ah/1 h, as defined
t 5
t
in IEC 61434:1996, and based on the rated capacity (C Ah) of the cell or battery
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.
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.
IEC CDV 63115-1 © IEC 2026
5 Marking and designation
5.1 Marking
The marking information per item is shown in Table 1. Each part that is installed or maintained
shall carry clear and durable markings giving the specified information.
If there are designations on a battery system, battery pack or module and if full traceability of
all parts can be ensured by the battery system manufacturer, designations are not necessary
on inner parts. This applies only to battery systems maintained at the battery system
manufacturer's location.
However, for a transportable unit (i.e. a unit that is being shipped), it is necessary to provide
the marking information on the main transportable unit. Furthermore, if there is an arrangement
between the purchaser and the manufacturer as regards marking, the unit shall comply with
that arrangement.
Table 1 – Marking per item type
Marking information Cell or Module or battery Battery
monobloc pack system
Secondary sealed nickel-metal hydride battery or Ni- R R R
MH
Polarity R R R
Date of manufacture (which may be in code) R R R
Name or identification of manufacturer or supplier R R R
Rated capacity R R R
Nominal voltage R R R
Appropriate warning statement (including disposal R R R
instruction)
Cell designation as specified in 5.2 R -- --
Battery structure as specified in 5.3 -- R R
NOTE "R" = required;
"--" = unnecessary or not applicable
5.2 Cell and monobloc designation
Sealed nickel-metal hydride cells and monoblocs shall be designated with following form:
𝐻𝐴 𝑁 [𝑆 ]𝐴 (1)
1 1 1 2
where
A designates
...