SIST EN 61951-1:2014

Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable sealed rechargeable single cells - Part 1: Nickel-cadmium

EN IEC 61951-1 specifies marking, designation, dimensions, tests and requirements for portable sealed nickel-cadmium small prismatic, cylindrical and button rechargeable single cells, suitable for use in any orientation.

/

Accumulateurs alcalins et autres accumulateurs à électrolyte non-acide - Accumulateurs individuels portables étanches - Partie 1: Nickel-cadmium

La CEI 61951-1:2013 spécifie le marquage, la désignation, les dimensions, les essais et les prescriptions applicables aux petits éléments parallélépipédiques, aux éléments cylindriques et aux éléments boutons, individuels, portables, rechargeables, étanches, au nickel-cadmium, pouvant être utilisés dans toutes les orientations. Cette troisième édition annule et remplace la deuxième édition parue en 2003 ainsi que son amendement 1 paru en 2005. Elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:  - addition de plusieurs nouvelles dimensions d'éléments;  - introduction d'un nouveau type d'élément J;  - création de l'Annexe A (informative): mesure de la capacité d'une batterie.

Sekundarni členi in baterije z alkalnimi ali drugimi nekislinskimi elektroliti - Prenosne posamezne ponovno polnljive hermetične celice - 1. del: Nikelj-kadmij (IEC 61951-1:2013)

Standard EN IEC 61951-1 določa označevanje, določanje, dimenzije, preskuse in zahteve za majhne posamezne prenosne ponovno polnljive hermetične nikelj-kadmijeve prizmatične, cilindrične in gumbaste celice, ki se uporabljajo pri vsaki orientaciji.

General Information

• Status: Withdrawn
• Publication Date: 08-Jul-2014
• Withdrawal Date: 15-Aug-2021
• ICS: 29.220.30 - Alkaline secondary cells and batteries
• Technical Committee: ISCB - Secondary cells and batteries
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 27-Jul-2021
• Due Date: 19-Aug-2021
• Completion Date: 16-Aug-2021
• Ref Project: EN 61951-1:2014 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable sealed rechargeable single cells - Part 1: Nickel-cadmium

Relations

• Replaces: SIST EN 61951-1:2004/A1:2006 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable sealed rechargeable single cells -- Part 1: Nickel-cadmium
• Effective Date: 19-Jun-2012
• Replaces: SIST EN 61951-1:2004 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable sealed rechargeable single cells - Part 1: Nickel-cadmium
• Effective Date: 19-Jun-2012
• Replaced By: SIST EN 61951-1:2018 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Secondary sealed cells and batteries for portable applications - Part 1: Nickel cadmium
• Effective Date: 07-Jun-2022
• Revised: SIST EN 61951-1:2004/A1:2006 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable sealed rechargeable single cells -- Part 1: Nickel-cadmium
• Effective Date: 06-May-2014
• Revised: SIST EN 61951-1:2004 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable sealed rechargeable single cells - Part 1: Nickel-cadmium
• Effective Date: 06-May-2014
• Revised: SIST EN 61951-1:2018 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Secondary sealed cells and batteries for portable applications - Part 1: Nickel cadmium
• Effective Date: 05-May-2015
• Replaces: SIST EN 61951-1:2004 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable sealed rechargeable single cells - Part 1: Nickel-cadmium
• Effective Date: 29-Jan-2023
• Replaces: SIST EN 61951-1:2004/A1:2006 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable sealed rechargeable single cells -- Part 1: Nickel-cadmium
• Effective Date: 29-Jan-2023
• Replaces: SIST EN 61951-1:2004 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable sealed rechargeable single cells - Part 1: Nickel-cadmium
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61951-1:2014
01-september-2014
1DGRPHãþD
SIST EN 61951-1:2004
SIST EN 61951-1:2004/A1:2006
6HNXQGDUQLþOHQLLQEDWHULMH]DONDOQLPLDOLGUXJLPLQHNLVOLQVNLPLHOHNWUROLWL
3UHQRVQHSRVDPH]QHSRQRYQRSROQOMLYHKHUPHWLþQHFHOLFHGHO1LNHOMNDGPLM
,(&
Secondary cells and batteries containing alkaline or other non-acid electrolytes - Portable
sealed rechargeable single cells - Part 1: Nickel-cadmium
/
Accumulateurs alcalins et autres accumulateurs à électrolyte non-acide - Accumulateurs
individuels portables étanches - Partie 1: Nickel-cadmium
Ta slovenski standard je istoveten z: EN 61951-1:2014
ICS:
29.220.30 $ONDOQLVHNXQGDUQLþOHQLLQ Alkaline secondary cells and
EDWHULMH batteries
SIST EN 61951-1:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 61951-1:2014

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SIST EN 61951-1:2014


EUROPEAN STANDARD EN 61951-1

NORME EUROPÉENNE

EUROPÄISCHE NORM
May 2014
ICS 29.220.30 Supersedes EN 61951-1:2003
English Version
Secondary cells and batteries containing alkaline or other non-
acid electrolytes - Portable sealed rechargeable single cells -
Part 1: Nickel-cadmium
(IEC 61951-1:2013)
Accumulateurs alcalins et autres accumulateurs à Akkumulatoren und Batterien mit alkalischen oder anderen
électrolyte non-acide - Accumulateurs individuels portables nichtsäurehaltigen Elektrolyten - Tragbare wiederaufladbare
étanches - Partie 1: Nickel-cadmium gasdichte Einzelzellen - Teil 1: Nickel-Cadmium
(CEI 61951-1:2013) (IEC 61951-1:2013)
This European Standard was approved by CENELEC on 2013-11-19. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 61951-1:2014 E

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SIST EN 61951-1:2014
EN 61951-1:2014 - 2 -
Foreword
The text of document 21A/521/FDIS, future edition 3 of IEC 61951-1, prepared by SC 21A, Secondary
cells and batteries containing alkaline or other non-acid electrolytes, of IEC TC 21, Secondary cells and
batteries, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 61951-1:2014.
The following dates were fixed:
– latest date by which the EN has to be implemented (dop) 2014-11-16
at national level by publication of an identical
national standard or by endorsement
– latest date by which the national standards conflicting (dow) 2016-11-19
with the EN have to be withdrawn

This European Standard supersedes EN 61951-1:2003.
EN 61951-1:2014 includes the following significant technical changes with respect to EN 61951-1:2003:
— addition of several new cell sizes;
— introduction of a new cell type J;
— creation of Annex A: Capacity of batteries measurement.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
Endorsement notice
The text of the International Standard IEC 61951-1:2013 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60051 series NOTE  Harmonized in EN 60051 series.
IEC 61434 NOTE  Harmonized as EN 61434.

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SIST EN 61951-1:2014
- 3 - EN 61951-1:2014
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 60050-482 - International Electrotechnical Vocabulary - - -
Part 482: Primary and secondary cells and
batteries


1)
IEC 60086-1 Primary batteries - EN 60086-1
Part 1: General

-
2)
IEC 60086-2 Primary batteries - EN 60086-2 -
Part 2: Physical and electrical specifications


IEC 60410 - Sampling plans and procedures - -
for inspection by attributes


IEC 61959 - Secondary cells and batteries containing EN 61959 -
alkaline or other non-acid electrolytes -
Mechanical tests for sealed portable
secondary cells and batteries


IEC 62133 - Secondary cells and batteries containing EN 62133 -
alkaline or other non-acid electrolytes -
Safety requirements for portable sealed
secondary cells, and for batteries made from
them, for use in portable applications




1)
EN 60086-1 is superseded by EN 60086-1:2011, which is based on IEC 60086-1:2011.
2)
EN 60086-2 is superseded by EN 60086-2:2011, which is based on IEC 60086-2:2011.

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SIST EN 61951-1:2014

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SIST EN 61951-1:2014



IEC 61951-1

®


Edition 3.0 2013-10




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Secondary cells and batteries containing alkaline or other non-acid

electrolytes – Portable sealed rechargeable single cells –

Part 1: Nickel-cadmium




Accumulateurs alcalins et autres accumulateurs à électrolyte non acide –

Accumulateurs individuels portables étanches –


Partie 1: Nickel-cadmium













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX W


ICS 29.220.30 ISBN 978-2-8322-1122-9



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 61951-1:2014
– 2 – 61951-1  IEC:2013
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Parameter measurement tolerances . 8
5 Cell designation and marking . 9
5.1 Cell designation . 9
5.1.1 Small prismatic cells and cylindrical cells . 9
5.1.2 Button cells . 10
5.2 Cell termination . 10
5.3 Marking . 11
5.3.1 Small prismatic cells and cylindrical cells . 11
5.3.2 Button cells . 11
6 Dimensions . 12
6.1 Small prismatic cells and cylindrical cells . 12
6.1.1 General . 12
6.1.2 Small prismatic cells . 12
6.1.3 Cylindrical cells . 13
6.2 Button cells. 15
7 Electrical tests . 16
7.1 General . 16
7.2 Charging procedure for test purposes . 16
7.3 Discharge performance . 16
7.3.1 General . 16
7.3.2 Discharge performance at 20 °C . 16
7.3.3 Discharge performance at –18 °C . 17
7.3.4 Discharge performance for rapid charge cells (R cells) . 18
7.4 Charge (capacity) retention . 18
7.5 Endurance . 18
7.5.1 Endurance in cycles . 18
7.5.2 Permanent charge endurance . 21
7.6 Charge acceptance at constant voltage . 26
7.7 Overcharge. 26
7.7.1 Small prismatic cells . 26
7.7.2 L, M, H or X cylindrical and button cells . 27
7.7.3 LT/LU, MT/MU or HT/HU cylindrical cells . 27
7.7.4 J cylindrical cells . 27
7.7.5 JT cylindrical cells . 28
7.7.6 R cylindrical cells . 28
7.8 Gas release device operation . 28
7.9 Storage . 29
7.10 Charge acceptance at +55 °C for LT, MT or HT cylindrical cells . 29
7.11 Trickle charge acceptance for JT cylindrical cells . 30
7.12 Internal resistance . 30
7.12.1 General . 30

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SIST EN 61951-1:2014
61951-1  IEC:2013 – 3 –
7.12.2 Measurement of the internal a.c. resistance . 31
7.12.3 Measurement of the internal d.c. resistance . 31
8 Mechanical tests . 32
9 Safety requirements . 32
10 Type approval and batch acceptance . 32
10.1 General . 32
10.2 Type approval . 32
10.2.1 Type approval for small prismatic cells . 32
10.2.2 Type approval for cylindrical and button cells. 32
10.3 Batch acceptance . 34
Annex A (informative) Procedure for measuring the capacity of a battery . 36
Bibliography . 37

Figure 1 – Jacketed cylindrical cells . 12
Figure 2 – Jacketed small prismatic cells . 12
Figure 3 – Jacketed cells dimensionally interchangeable with primary cells . 13
Figure 4 – Button cells . 15

Table 1 – Dimensions of jacketed small prismatic cells . 12
Table 2 – Dimensions of jacketed cylindrical cells dimensionally interchangeable with
primary cells . 13
Table 3 – Dimensions of jacketed cylindrical cells not dimensionally interchangeable
with primary cells . 14
Table 4 – Dimensions of button cells . 15
Table 5 – Discharge performance at 20 °C for small prismatic cells and cylindrical cells . 16
Table 6 – Discharge performance at 20 °C for button cells . 17
Table 7 – Discharge performance at –18 °C for small prismatic cells . 17
Table 8 – Discharge performance at –18 °C for cylindrical cells . 17
Table 9 – Discharge performance at –18 °C for button cells . 18
Table 10 – Endurance in cycles for small prismatic cells and cylindrical cells not
dimensionally interchangeable with primary cells . 19
Table 11 – Endurance in cycles for H or X cells . 20
Table 12 – Endurance in cycles for cylindrical X cells . 20
Table 13 – Endurance in cycles for HR or XR cells . 21
Table 14 – Endurance in cycles for button cells . 21
Table 15 – Permanent charge endurance for L, M, J, H or X cylindrical cells . 22
Table 16 – Permanent charge endurance for button cells . 22
Table 17 – Permanent charge endurance for LT, MT, or HT cylindrical cells . 24
Table 18 – Permanent charge endurance for LU, MU, or HU cylindrical cells . 26
Table 19 – Overcharge at 0 °C . 27
Table 20 – Charge and discharge at +55 °C . 30
Table 21 – Trickle charge acceptance for JT cylindrical cells . 30
Table 22 – Constant discharge currents used for measurement of d.c. resistance . 31
Table 23 – Sequence of tests for type approval for small prismatic cells . 32
Table 24 – Sequence of tests for type approval for cylindrical cells . 33

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SIST EN 61951-1:2014
– 4 – 61951-1  IEC:2013
Table 25 – Sequence of tests for type approval for button cells . 34
Table 26 – Recommended test sequence for batch acceptance . 35

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SIST EN 61951-1:2014
61951-1  IEC:2013 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
PORTABLE SEALED RECHARGEABLE SINGLE CELLS –

Part 1: Nickel-cadmium


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
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) 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 61951-1 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.
This third edition cancels and replaces the second edition (2003) and its amendment 1 (2005)
of which it constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• addition of several new cell sizes;
• introduction of a new cell type J;
• creation of Annex A: Capacity of batteries measurement.

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SIST EN 61951-1:2014
– 6 – 61951-1  IEC:2013
The text of this standard is based on the following documents:
FDIS Report on voting
21A/521/FDIS 21A/525/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 – Portable sealed rechargeable
single cells, 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 web site 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.

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SIST EN 61951-1:2014
61951-1  IEC:2013 – 7 –
SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
PORTABLE SEALED RECHARGEABLE SINGLE CELLS –

Part 1: Nickel-cadmium



1 Scope
This part of IEC 61951 specifies marking, designation, dimensions, tests and requirements for
portable sealed nickel-cadmium small prismatic, cylindrical and button rechargeable single
cells, suitable for use in any orientation.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. 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, International Electrotechnical Vocabulary – Chapter 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 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, 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
3 Terms and definitions
For the purposes of this document, the terms and definitions given in the IEC 60050-482 and
the following apply.
3.1
nominal voltage
suitable approximate value of 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-cadmium rechargeable single cell: 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.]

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SIST EN 61951-1:2014
– 8 – 61951-1  IEC:2013
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
5
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 battery is the quantity of electricity C Ah (ampere-hours) declared by the
5
manufacturer which a battery can deliver during a 5 h period, when charged, stored and discharged under the
procedure described in Annex A.
[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 a circular cross-section in which the overall height is less than the overall diameter
3.6
nickel-cadmium cell
secondary cell containing a nickel hydroxide compound for the positive electrode, cadmium
compound for the negative electrode, and potassium hydroxide or other alkaline solution as
electrolyte. Positive electrodes are isolated from negative electrodes by a separator
3.7
sealed cell
cell which remains closed and does not release either gas or liquid when operated within the
limits 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.
[SOURCE: IEC 60050-482:2004, 482-05-17, modified – The existing note has been developed
into Notes 1 and 2 to entry.]
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;

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SIST EN 61951-1:2014
61951-1  IEC:2013 – 9 –
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.
5 Cell designation and marking
5.1 Cell designation
5.1.1 Small prismatic cells and cylindrical cells
5.1.1.1 General
Sealed nickel-cadmium 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);
• high medium 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 15 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 rapid charge, typically at 1,0 I A, a letter “R” is placed after the
t

letter L, M, J, H or X.
5.1.1.2 Small prismatic cells
Sealed nickel
...