IEC 60086-3:2021

IEC 60086-3
Edition 5.0 2021-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Primary batteries –
Part 3: Watch batteries
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IEC 60086-3
Edition 5.0 2021-04
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Primary batteries –
Part 3: Watch batteries
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.220.10; 39.040.10 ISBN 978-2-8322-9760-5

– 2 – IEC 60086-3:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Physical requirements . 8
4.1 Battery dimensions, symbols and size codes . 8
4.2 Terminals . 13
4.3 Projection of the negative terminal (h ) . 13
4.4 Shape of negative terminal battery . 13
4.5 Mechanical resistance to pressure . 14
4.6 Deformation . 14
4.7 Leakage . 14
4.8 Marking . 14
4.8.1 General . 14
4.8.2 Disposal . 15
5 Electrical requirements . 15
5.1 Electrochemical system, nominal voltage, end-point voltage and open-circuit
voltage . 15
5.2 Closed circuit voltage U (CCV), internal resistance and impedance . 15
cc
5.3 Capacity . 16
5.4 Capacity retention . 16
6 Sampling and quality assurance . 16
7 Test methods . 16
7.1 Shape and dimensions . 16
7.1.1 Shape requirement . 16
7.2 Electrical characteristics . 17
7.2.1 Environmental conditions . 17
7.2.2 Equivalent circuit – Effective internal resistance – DC method . 17
7.2.3 Equipment . 18
7.2.4 Measurement of open-circuit voltage U (OCV) and closed circuit
oc
voltage U (CCV) . 18
cc
7.2.5 Calculation of the internal resistance R . 19
i
7.2.6 Measurement of the capacity . 19
7.2.7 Calculation of the internal resistance R during discharge in case of
i
method A (optional) . 21
7.3 Test methods for determining the resistance to leakage . 23
7.3.1 Preconditioning and initial visual examination . 23
7.3.2 High temperature and humidity test . 23
7.3.3 Test by temperature cycles . 23
8 Visual examination and acceptance conditions . 24
8.1 Preconditioning . 24
8.2 Magnification . 24
8.3 Lighting .
8.3 Leakage levels and classification . 24

8.4 Acceptance conditions . 25
Annex A (normative) Designation . 27
Bibliography . 28

Figure 1 – Dimensional drawing . 8
Figure 2 – Shape of negative terminal battery . 13
Figure 3 – Shape requirement . 16
Figure 4 – Schematic voltage transient . 17
Figure 5 – Curve: U = f(t) . 18
Figure 6 – Circuitry principle . 19
Figure 7 – Circuitry principle for method A . 20
Figure 8 – Circuitry principle for method B . 21
Figure 9 – Test by temperature cycles . 23

Table 1 – Zinc systems L and S dimensions and size codes . 9
Table 2 – Lithium systems B and C dimensions and size codes . 11
Table 3 – Minimum Values of l . 14
Table 4 – Applied force F by battery dimensions . 14
Table 5 – Standardised electrochemical systems . 15
Table 6 – Test method for U (CCV) measurement . 19
cc
Table 7 – Test method A for U (CCV) measurement . 20
cc
Table 8 – Discharge resistance (values) .
Table 8 – Storage conditions for the recommended test . 23
Table 9 – Storage conditions for optional test . 23
Table 10 – Leakage levels and classification . 24

– 4 – IEC 60086-3:2021 RLV © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PRIMARY BATTERIES –
Part 3: Watch batteries
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
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This redline version of the official IEC Standard allows the user to identify the changes made to
the previous edition IEC 60086
...

IEC 60086-3
Edition 5.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Primary batteries –
Part 3: Watch batteries
Piles électriques –
Partie 3: Piles pour montres
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

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CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC online collection - oc.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 000 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 18 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc

If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC
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IEC 60086-3
Edition 5.0 2021-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Primary batteries –
Part 3: Watch batteries
Piles électriques –
Partie 3: Piles pour montres
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.10; 39.040.10 ISBN 978-2-8322-1030-9

– 2 – IEC 60086-3:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Physical requirements . 8
4.1 Battery dimensions, symbols and size codes . 8
4.2 Terminals . 11
4.3 Projection of the negative terminal (h ) . 11
4.4 Shape of battery . 11
4.5 Mechanical resistance to pressure . 12
4.6 Deformation . 12
4.7 Leakage . 12
4.8 Marking . 12
4.8.1 General . 12
4.8.2 Disposal . 13
5 Electrical requirements . 13
5.1 Electrochemical system, nominal voltage, end-point voltage and open-circuit
voltage . 13
5.2 Closed circuit voltage U (CCV), internal resistance and impedance . 13
cc
5.3 Capacity . 13
5.4 Capacity retention . 13
6 Sampling and quality assurance . 14
7 Test methods . 14
7.1 Shape and dimensions . 14
7.1.1 Shape requirement . 14
7.2 Electrical characteristics . 14
7.2.1 Environmental conditions . 14
7.2.2 Equivalent circuit – Effective internal resistance – DC method . 14
7.2.3 Equipment . 15
7.2.4 Measurement of open-circuit voltage U (OCV) and closed circuit
oc
voltage U (CCV) . 16
cc
7.2.5 Calculation of the internal resistance R . 17
i
7.2.6 Measurement of the capacity . 17
7.2.7 Calculation of the internal resistance R during discharge in case of
i
method A (optional) . 19
7.3 Test methods for determining the resistance to leakage . 19
7.3.1 Preconditioning and initial visual examination . 19
7.3.2 High temperature and humidity test . 20
7.3.3 Test by temperature cycles . 20
8 Visual examination and acceptance conditions . 20
8.1 Preconditioning . 20
8.2 Magnification . 21
8.3 Leakage levels and classification . 21
8.4 Acceptance conditions . 22

Annex A (normative) Designation . 23
Bibliography . 24

Figure 1 – Dimensional drawing . 8
Figure 2 – Shape of battery. 11
Figure 3 – Shape requirement . 14
Figure 4 – Schematic voltage transient . 15
Figure 5 – Curve: U = f(t) . 16
Figure 6 – Circuitry principle . 16
Figure 7 – Circuitry principle for method A . 18
Figure 8 – Circuitry principle for method B . 19
Figure 9 – Test by temperature cycles . 20

Table 1 – Zinc systems L and S dimensions and size codes . 9
Table 2 – Lithium systems B and C dimensions and size codes . 10
Table 3 – Values of l . 11
Table 4 – Applied force F by battery dimensions . 12
Table 5 – Standardised electrochemical systems . 13
Table 6 – Test method for U (CCV) measurement . 17
cc
Table 7 – Test method A for U (CCV) measurement . 18
cc
Table 8 – Storage conditions for the recommended test . 20
Table 9 – Storage conditions for optional test . 20
Table 10 – Leakage levels and classification . 21

– 4 – IEC 60086-3:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PRIMARY BATTERIES –
Part 3: Watch batteries
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 deci
...