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IEC 60086-3
Edition 5.0 2021-04
INTERNATIONAL
STANDARD
Primary batteries –
Part 3: Watch batteries
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IEC 60086-3
Edition 5.0 2021-04
INTERNATIONAL
STANDARD
Primary batteries –
Part 3: Watch batteries
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.220.10; 39.040.10 ISBN 978-2-8322-9686-8
– 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
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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 edition includes the following significant technical change
...