Secondary cells and batteries containing alkaline or other non-acid electrolytes - Secondary sealed cells and batteries for portable applications - Part 1: Nickel cadmium

IEC 61951-1:2013 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. 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 (informative): Capacity of batteries measurement.

Akkumulatoren und Batterien mit alkalischen oder anderen nichtsäurehaltigen Elektrolyten - Tragbare wiederaufladbare gasdichte Einzelzellen - Teil 1: Nickel-Cadmium

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

L'IEC 61951-1:2017 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-cadmium, 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; - 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).

Sekundarni členi in baterije z alkalnimi ali drugimi nekislinskimi elektroliti - Sekundarni hermetični členi in baterije za prenosne naprave - 1. del: Nikelj-kadmij

IEC 61951-1:2013 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. Ta tretja izdaja razveljavlja in nadomešča drugo izdajo (2003) in njeno dopolnilo 1 (2005), ter predstavlja tehnično popravljeno izdajo. Ta izdaja vključuje naslednje pomembne tehnične spremembe glede na prejšnjo izdajo:   – dodane so nove velikosti celic, – predstavitev novega tipa celice J, – oblikovanje dodatka A (informativno): Zmogljivost merjenja baterij.

General Information

Status
Published
Publication Date
17-Apr-2018
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
19-Mar-2018
Due Date
24-May-2018
Completion Date
18-Apr-2018

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SLOVENSKI STANDARD
SIST EN 61951-1:2018
01-maj-2018
1DGRPHãþD
SIST EN 61951-1:2014
6HNXQGDUQLþOHQLLQEDWHULMH]DONDOQLPLDOLGUXJLPLQHNLVOLQVNLPLHOHNWUROLWL

6HNXQGDUQLKHUPHWLþQLþOHQLLQEDWHULMH]DSUHQRVQHQDSUDYHGHO1LNHOMNDGPLM

Secondary cells and batteries containing alkaline or other non-acid electrolytes -

Secondary sealed cells and batteries for portable applications - Part 1: Nickel cadmium

Akkumulatoren und Batterien mit alkalischen oder anderen nichtsäurehaltigen

Elektrolyten - Tragbare wiederaufladbare gasdichte Einzelzellen - Teil 1: Nickel-

Cadmium

Accumulateurs alcalins et autres accumulateurs à électrolyte non acide - Accumulateurs

étanches pour applications portables - Partie 1: Nickel cadmium
Ta slovenski standard je istoveten z: EN 61951-1:2017
ICS:
29.220.30 $ONDOQLVHNXQGDUQLþOHQLLQ Alkaline secondary cells and
EDWHULMH batteries
SIST EN 61951-1:2018 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 61951-1:2018
---------------------- Page: 2 ----------------------
SIST EN 61951-1:2018
EUROPEAN STANDARD EN 61951-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2017
ICS 29.220.30 Supersedes EN 61951-1:2014
English Version
Secondary cells and batteries containing alkaline or other non-
acid electrolytes - Secondary sealed cells and batteries for
portable applications - Part 1: Nickel-cadmium
(IEC 61951-1:2017)

Accumulateurs alcalins et autres accumulateurs à Akkumulatoren und Batterien mit alkalischen oder anderen

électrolyte non acide - Accumulateurs étanches pour nichtsäurehaltigen Elektrolyten - Tragbare wiederaufladbare

applications portables - Partie 1: Nickel-cadmium gasdichte Einzelzellen - Teil 1: Nickel-Cadmium

(IEC 61951-1:2017) (IEC 61951-1:2017)

This European Standard was approved by CENELEC on 2017-04-11. 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, Serbia, 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

© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 61951-1:2017 E
---------------------- Page: 3 ----------------------
SIST EN 61951-1:2018
EN 61951-1:2017
European foreword

The text of document 21A/622/FDIS, future edition 4 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 approved by CENELEC as

EN 61951-1:2017.
The following dates are fixed:
• latest date by which the document has to be (dop) 2018-01-11
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2020-04-11
• latest date by which the national
standards conflicting with the
document have to be withdrawn
This document supersedes EN 61951-1:2014.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 61951-1:2017 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 as EN 60051 Series.
IEC 60086 Series NOTE Harmonized as EN 60086 Series.
IEC 61434 NOTE Harmonized as EN 61434.
---------------------- Page: 4 ----------------------
SIST EN 61951-1:2018
EN 61951-1:2017
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu
Publication Year Title EN/HD Year
IEC 60050-482 2004 International Electrotechnical Vocabulary - -
(IEV) -
Part 482: Primary and secondary cells and
batteries
IEC 60086-1 - Primary batteries - EN 60086-1 -
Part 1: General
IEC 60086-2 - Primary batteries - EN 60086-2 -
Part 2: Physical and electrical
specifications
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 62133-1 - Secondary cells and batteries containing EN 62133-1 -
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
---------------------- Page: 5 ----------------------
SIST EN 61951-1:2018
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SIST EN 61951-1:2018
IEC 61951-1
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 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 978-2-8322-4010-6

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
---------------------- Page: 7 ----------------------
SIST EN 61951-1:2018
– 2 – IEC 61951-1:2017 © 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 ........................................................................ 9

5.1 Cell and battery designation .................................................................................... 9

5.1.1 Small prismatic cells and cylindrical cells ......................................................... 9

5.1.2 Button cells.................................................................................................... 11

5.1.3 Batteries ........................................................................................................ 11

5.2 Cell or battery termination ..................................................................................... 11

5.3 Marking ................................................................................................................. 11

5.3.1 Small prismatic cells and cylindrical cells ....................................................... 11

5.3.2 Button cells.................................................................................................... 12

5.3.3 Batteries ........................................................................................................ 12

5.4 Exemption of wording............................................................................................ 12

6 Dimensions.................................................................................................................... 12

6.1 Small prismatic cells and cylindrical cells .............................................................. 12

6.1.1 General ......................................................................................................... 12

6.1.2 Small prismatic cells ...................................................................................... 13

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

7.2.1 Charging procedure for cell............................................................................ 16

7.2.2 Charging procedure for battery ...................................................................... 16

7.3 Discharge performance ......................................................................................... 17

7.3.1 General ......................................................................................................... 17

7.3.2 Discharge performance at 20 °C .................................................................... 17

7.3.3 Discharge performance at –18 °C .................................................................. 19

7.3.4 Discharge performance for rapid charge cells (R cells) .................................. 20

7.4 Charge (capacity) retention ................................................................................... 20

7.5 Endurance ............................................................................................................ 20

7.5.1 Endurance in cycles....................................................................................... 20

7.5.2 Permanent charge endurance ........................................................................ 24

7.6 Charge acceptance at constant voltage ................................................................. 28

7.7 Overcharge ........................................................................................................... 28

7.7.1 Small prismatic cells ...................................................................................... 28

7.7.2 L, M, H or X cylindrical and button cells ......................................................... 29

7.7.3 LT/LU, MT/MU or HT/HU cylindrical cells ....................................................... 29

7.7.4 J cylindrical cells ........................................................................................... 29

7.7.5 JT cylindrical cells ......................................................................................... 30

7.7.6 R cylindrical cells ........................................................................................... 30

7.8 Safety device operation ........................................................................................ 31

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IEC 61951-1:2017 © IEC 2017 – 3 –

7.9 Button cells or batteries storage, small prismatic cells or batteries storage,

cylindrical cells or batteries storage ...................................................................... 31

7.10 Charge acceptance at +55 °C for LT, MT or HT cylindrical cells ............................ 32

7.11 Trickle charge acceptance for JT cylindrical cells .................................................. 32

7.12 Internal resistance ................................................................................................ 33

7.12.1 General ......................................................................................................... 33

7.12.2 Measurement of the internal AC resistance .................................................... 33

7.12.3 Measurement of the internal DC resistance ................................................... 34

8 Mechanical tests ............................................................................................................ 34

9 Safety requirements ...................................................................................................... 34

10 Type approval and batch acceptance ............................................................................. 34

10.1 General ................................................................................................................. 34

10.2 Type approval ....................................................................................................... 35

10.2.1 Type approval for small prismatic cells .......................................................... 35

10.2.2 Type approval for cylindrical and button cells ................................................ 35

10.2.3 Type approval for batteries ............................................................................ 37

10.3 Batch acceptance ................................................................................................. 38

Bibliography .......................................................................................................................... 40

Figure 1 – Jacketed cylindrical cells ...................................................................................... 13

Figure 2 – Jacketed small prismatic cells .............................................................................. 13

Figure 3 – Jacketed cells dimensionally interchangeable with primary cells .......................... 14

Figure 4 – Button cells .......................................................................................................... 15

Table 1 – Dimensions of jacketed small prismatic cells ......................................................... 13

Table 2 – Dimensions of jacketed cylindrical cells dimensionally interchangeable with

primary cells ......................................................................................................................... 14

Table 3 – Dimensions of jacketed cylindrical cells not dimensionally interchangeable

with primary cells .................................................................................................................. 15

Table 4 – Dimensions of button cells..................................................................................... 16

Table 5 – Discharge performance at 20 °C for small prismatic cells and cylindrical cells ....... 17

Table 6 – Discharge performance at 20 °C for button cells .................................................... 18

Table 7 – Discharge performance at 20 °C for batteries ........................................................ 18

Table 8 – Rated capacity (mAh) compliance test (example) .................................................. 19

Table 9 – Discharge performance at –18 °C for small prismatic cells .................................... 19

Table 10 – Discharge performance at –18 °C for cylindrical cells .......................................... 19

Table 11 – Discharge performance at –18 °C for button cells ................................................ 20

Table 12 – Endurance in cycles for small prismatic cells and cylindrical cells not

dimensionally interchangeable with primary cells .................................................................. 21

Table 13 – Endurance in cycles for cylindrical cells dimensionally interchangeable with

primary cells ......................................................................................................................... 21

Table 14 – Endurance in cycles for H or X cells .................................................................... 22

Table 15 – Endurance in cycles for cylindrical X cells ........................................................... 22

Table 16 – Endurance in cycles for HR or XR cells ............................................................... 23

Table 17 – Endurance in cycles for button cells .................................................................... 23

Table 18 – Permanent charge endurance for L, M, J, H or X cylindrical cells......................... 24

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SIST EN 61951-1:2018
– 4 – IEC 61951-1:2017 © IEC 2017

Table 19 – Permanent charge endurance for button cells ...................................................... 24

Table 20 – Permanent charge endurance for LT, MT, or HT cylindrical cells ......................... 26

Table 21 – Permanent charge endurance for LU, MU, or HU cylindrical cells ........................ 28

Table 22 – Overcharge at 0 °C .............................................................................................. 29

Table 23 – Capacity deterioration due to storage period for cells or batteries ........................ 32

Table 24 – Charge and discharge at +55 °C .......................................................................... 32

Table 25 – Trickle charge acceptance for JT cylindrical cells ................................................ 33

Table 26 – Constant discharge currents used for measurement of DC resistance ................. 34

Table 27 – Sequence of tests for type approval for small prismatic cells ............................... 35

Table 28 – Sequence of tests for type approval for cylindrical cells ....................................... 36

Table 29 – Sequence of tests for type approval for button cells ............................................. 37

Table 30 – Sequence of tests for type approval for batteries ................................................. 38

Table 31 – Recommended test sequence for batch acceptance ............................................ 39

---------------------- Page: 10 ----------------------
SIST EN 61951-1:2018
IEC 61951-1:2017 © IEC 2017 – 5 –
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
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 fourth edition cancels and replaces the third edition published in 2013 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;
• revision of Figure 3 (6.1.3.1);
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SIST EN 61951-1:2018
– 6 – IEC 61951-1:2017 © IEC 2017
• 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/622/FDIS 21A/630/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.
---------------------- Page: 12 ----------------------
SIST EN 61951-1:2018
IEC 61951-1:2017 © IEC 2017 – 7 –
SECONDARY CELLS AND BATTERIES CONTAINING
ALKALINE OR OTHER NON-ACID ELECTROLYTES –
SECONDARY SEALED CELLS AND BATTERIES
FOR PORTABLE APPLICATIONS –
Part 1: Nickel-cadmium
1 Scope

This part of IEC 61951 specifies marking, designation, dimensions, tests and requirements for

secondary sealed nickel-cadmium 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 voltage used to designate or identify a cell or a battery

Note 1 to entry: The nominal voltage of a sealed nickel-cadmium rechargeable single cell: 1,2 V.

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SIST EN 61951-1:2018
– 8 – IEC 61951-1:2017 © IEC 2017

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 a 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

conditions specified 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 a circular cross-section in which the overall height is less than the overall diameter

3.6
nickel-cadmium cell

cell containing a nickel hydroxide compound for the positive electrode, a cadmium compound

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- cadmium 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.

[SOURCE: IEC 60050-482:2004, 482-05-17, modified – The existing note has been developed

into Notes 1 and 2 to entry.]
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SIST EN 61951-1:2018
IEC 61951-1:2017 © IEC 2017 – 9 –
...

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