IEC/FDIS 60086-3

Primary batteries

Piles électriques

General Information

• Status: Published
• ICS: 29.220.10 - Primary cells and batteries
• ICS: 39.040.10 - Watches
• Technical Committee: ISO/TC 114 - Horology
• Drafting Committee: ISO/TC 114 - Horology
• Current Stage: 5060 - Close of voting Proof returned by Secretariat
• Start Date: 17-Aug-2021
• Completion Date: 16-Aug-2021

Standards Content (sample)

FINAL
INTERNATIONAL IEC/FDIS
DRAFT
STANDARD 60086-3
ISO/TC 114
Primary batteries —
Secretariat: SNV
Voting begins on:
Part 3:
2021-06-21
Watch batteries
Voting terminates on:
2021-08-16
Piles électriques —
Partie 3: Piles pour montres
This draft is submitted to a parallel vote in ISO and in IEC.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
IEC/FDIS 60086-3:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. IEC 2021
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– 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

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

voltage U (CCV) ......................................................................................... 16

7.2.5 Calculation of the internal resistance R ......................................................... 17

7.2.6 Measurement of the capacity ......................................................................... 17

7.2.7 Calculation of the internal resistance R during discharge in case of

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

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IEC 60086-3:2021 © IEC 2021 – 3 –

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

Table 7 – Test method A for U (CCV) measurement .......................................................... 18

Table 8 – Storage conditions for the recommended test ........................................................ 20

Table 9 – Storage conditions for optional test ....................................................................... 20

Table 10 – Leakage levels and classification ........................................................................ 21

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– 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 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 60086-3 has been prepared by IEC technical committee 35: Primary

cells and batteries, and ISO technical committee 114: Horology.

This fifth edition cancels and replaces the fourth edition published in 2016. This edition

constitutes a technical revision.
This publication is published as a double logo standard.

This edition includes the following significant technical changes with respect to the previous

edition:

a) reformatted Table 1 and Table 2. The reformatted tables are now divided by system.

Dimensional tolerances were changed when appropriate. Cell sizes were removed or added

based on the size prevalence in the market place;
were reformatted;
b) in Table 3 the minimum values of l
c) the minimum OCV for the S system in Table 5 was changed to 1,55 V.
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IEC 60086-3:2021 © IEC 2021 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
35/1467/FDIS 35/1470/RVD

Full information on the voting for the approval of this International Standard 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.

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/standardsdev/publications.

A list of all parts in the IEC 60086 series, published under the general title Primary batteries,

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 "http://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.
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– 6 – IEC 60086-3:2021 © IEC 2021
INTRODUCTION

This part of IEC 60086 provides specific requirements and information for primary watch

batteries. This part of IEC 60086 was prepared through joint work between the IEC and ISO to

benefit primary battery users, watch designers and battery manufacturers by ensuring the best

compatibility between batteries and watches.

This part of IEC 60086 will remain under continual scrutiny to ensure that the publication is kept

up to date with the advances in both battery and watch technologies.
NOTE Safety information is available in IEC 60086-4 and IEC 60086-5.
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IEC 60086-3:2021 © IEC 2021 – 7 –
PRIMARY BATTERIES –
Part 3: Watch batteries
1 Scope

This part of IEC 60086 specifies dimensions, designation, methods of tests and requirements

for primary batteries for watches. In several cases, a menu of test methods is given. When

presenting battery electrical characteristics and/or performance data, the manufacturer

specifies which test method was used.
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 60086-1, Primary batteries – Part 1: General
IEC 60086-2, Primary batteries – Part 2: Physical and electrical specifications
IEC 60086-4, Primary batteries – Part 4: Safety of lithium batteries

IEC 60086-5, Primary batteries – Part 5: Safety of batteries with aqueous electrolyte

3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60086-1 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
capacitive reactance

part of the internal resistance that leads to a voltage drop during the first seconds under load

3.2
capacity

electric charge (quantity of electricity) which a cell or battery can deliver under specified

discharge conditions

Note 1 to entry: The SI unit for electric charge is the coulomb (1 C = 1 As) but, in practice, capacity is usually

expressed in ampere hours (Ah).
3.3
fresh battery
undischarged battery 60 days maximum after date of manufacture
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– 8 – IEC 60086-3:2021 © IEC 2021
3.4
ohmic drop

part of the internal resistance that leads to a voltage drop immediately after switching the load

4 Physical requirements
4.1 Battery dimensions, symbols and size codes

Dimensions and tolerances of batteries for watches shall be in accordance with Figure 1,

Table 1 and Table 2. The dimensions of the batteries shall be tested in accordance with 7.1.

The symbols used to denote the various dimensions in Figure 1 are in accordance with

IEC 60086-2:2021, Clause 4.
Dimensions in millimetres
Key
h maximum overall height of the battery
h minimum distance between the flats of the positive and negative contacts
h minimum projection of the flat negative contact
maximum and minimum diameter of the battery
d minimum diameter of the flat positive contact
d minimum diameter of the flat negative contact
NOTE This numbering follows the harmonization in the IEC 60086 series.
Figure 1 – Dimensional drawing
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IEC 60086-3:2021 © IEC 2021 – 9 –
Table 1 – Zinc systems L and S dimensions and size codes
Dimensions in millimetres
Height h /h
Diameter
1 2
Code
10 12 14 16 20 21 26 27 30 31 36 42 54
Tolerance
Code
Tolerances
0 0 0 0 0 0 0 0 0 0 0 0 0
−0,10 −0,15 −0,15 −0,18 −0,20 −0,20 −0,20 −0,20 −0,20 −0,25 −0,25 −0,25 −0,25
4 4,8 1,05 1,65 2,15
−0,15
5 5,8 2,6 1,05 1,25 1,65 2,15 2,70
−0,15
6 6,8 3,0 1,45 1,65 2,15 2,60
−0,15
7 7,9 3,5 1,25 1,45 1,65 2,10 2,60 3,10 3,60 5,40
−0,15
9 9,5 4,5 1,05 1,25 1,45 1,65 2,05 2,70 3,60
−0,15
11 11,6 6,0 1,65 2,05 3,05 3,60 4,20 5,40
−0,20

NOTE Open boxes in the above matrix are not necessarily available for standardization due to the concept of overlapping tolerances.

See Annex A.
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Table 2 – Lithium systems B and C dimensions and size codes
Dimensions in millimetres
Height h /h
Diameter
1 2
Code
12 16 20 25 30 32 50
Tolerance
Code
Tolerances
0 0 0 0 0 0 0
−0,15 −0,18 −0,20 −0,20 −0,20 −0,25 −0,30
10 10,0 3,0 2,50
−0,15
12 12,5 4,0 1,60 2,00 2,50
−0,25
16 16 5,0 1,20 1,60 2,00 3,20
−0,25
20 20 8,0 1,20 1,60 2,50 3,20
−0,25
23 23 8,0 2,00 2,50
−0,25
24 24,5 8,0 3,00 5,00
−0,25

NOTE Open boxes in the above matrix are not necessarily available for standardization due to the concept of overlapping tolerances.

See Annex A.
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