IEC 60086-1:2011

IEC 60086-1 ®
Edition 11.0 2011-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Primary batteries –
Part 1: General
Piles électriques –
Partie 1: Généralités
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IEC 60086-1 ®
Edition 11.0 2011-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Primary batteries –
Part 1: General
Piles électriques –
Partie 1: Généralités
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX X
ICS 29.220.10 ISBN 978-2-88912-359-9

– 2 – 60086-1  IEC:2011
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Requirements . 11
4.1 General . 11
4.1.1 Design . 11
4.1.2 Battery dimensions . 11
4.1.3 Terminals . 11
4.1.4 Classification (electrochemical system) . 14
4.1.5 Designation . 14
4.1.6 Marking . 15
4.1.7 Interchangeability: battery voltage . 16
4.2 Performance . 16
4.2.1 Discharge performance. 16
4.2.2 Dimensional stability . 17
4.2.3 Leakage . 17
4.2.4 Open-circuit voltage limits . 17
4.2.5 Service output . 17
4.2.6 Safety . 17
5 Performance – Testing . 17
5.1 General . 17
5.2 Discharge testing . 17
5.2.1 General . 17
5.2.2 Application tests . 17
5.2.3 Service output tests . 18
5.3 Conformance check to a specified minimum average duration . 18
5.4 Calculation method of the specified value of minimum average duration . 19
5.5 OCV testing . 19
5.6 Battery dimensions . 19
5.7 Leakage and deformation . 19
6 Performance – Test conditions . 19
6.1 Pre-discharge conditioning . 19
6.2 Commencement of discharge tests after storage . 20
6.3 Discharge test conditions . 20
6.4 Load resistance . 20
6.5 Time periods . 20
6.6 Test condition tolerances . 21
6.7 Activation of ‘P’-system batteries . 21
6.8 Measuring equipment . 21
6.8.1 Voltage measurement . 21
6.8.2 Mechanical measurement . 21
7 Sampling and quality assurance . 21
7.1 Sampling . 21
7.1.1 Testing by attributes . 21

60086-1  IEC:2011 – 3 –
7.1.2 Testing by variables . 22
7.2 Product quality indices . 22
7.2.1 General . 22
7.2.2 Capability index (c ) . 22
p
7.2.3 Capability index (c ) . 22
pk
7.2.4 Performance index (p ) . 22
p
7.2.5 Performance index (p ) . 22
pk
8 Battery packaging . 23
Annex A (normative) Guidelines for the standardization of batteries . 24
Annex B (normative) Equipment design . 25
Annex C (normative) Designation system (nomenclature) . 27
Annex D (normative) Calculation method for the specified value of minimum average
duration . 40
Annex E (normative) Code of practice for packaging, shipment, storage, use and
disposal of primary batteries . 41
Annex F (informative) Standard discharge voltage U – Definition and method of
s
determination . 44
Annex G (informative) Preparation of standard methods of measuring performance
(SMMP) of consumer goods . 48
Bibliography . 49

Figure 1 – Small cell or battery gauge (inner dimensions) . 11
Figure 2 – Stud . 13
Figure C.1 – Designation system for round batteries: d < 100 mm; height h < 100 mm . 31
1 1
Figure C.2 – Diameter code for non-recommended diameters . 32
Figure C.3 – Height code for denoting the hundredths of a millimetre of height . 33
Figure C.4 – Designation system for round batteries: d ≥ 100 mm; height h ≥ 100 mm . 34
1 1
Figure C.5 – Designation system for non round batteries, dimensions < 100 mm . 35
Figure C.6 – Designation system for non-round batteries, dimensions ≥ 100 mm . 36
Figure F.1 – Normalized C/R-plot (schematic) . 45
Figure F.2 – Standard discharge voltage (schematic) . 46

Table 1 – Spacing of contacts . 13
Table 2 – Snap fastener connectors . 13
Table 3 – Standardized electrochemical systems . 14
Table 4 – Marking requirements . 15
Table 5 – Conditions for storage before and during discharge testing . 19
Table 6 – Resistive loads for new tests . 20
Table 7 – Time periods for new tests . 20
Table 8 – Test condition tolerances . 21
Table A.1 – Items necessary to standardize . 24
Table C.1 – Physical designation and dimensions of round cells and batteries . 28
Table C.2 – Physical designation and nominal overall dimensions of flat cells . 29
Table C.3 – Physical designation and dimensions of square cells and batteries . 29
Table C.4 – Diameter code for recommended diameters . 32

– 4 – 60086-1  IEC:2011
Table C.5 – Physical designation and dimensions of round cells and batteries based on
Clause C.2 . 38
Table C.6 – Physical designation and dimensions of non-round batteries based on
Clause C.2 . 39
Table F.1 – Standard discharge voltage by system . 47

60086-1  IEC:2011 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PRIMARY BATTERIES –
Part 1: General
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 60086-1 has been prepared by IEC technical committee 35:
Primary cells and batteries.
This eleventh edition cancels and replaces the tenth edition (2006) and constitutes a technical
revision.
The major technical changes with respect to the previous edition are:
– the clarification of the humidity controls for testing various battery types;
– the modification of the standardization guidelines to allow for standardization of
electrochemical systems;
– the standardization of the lithium sulfuryl chloride (LiSO Cl ) and lithium sulphur dioxide
2 2
(LiSO ) electrochemical systems.
– 6 – 60086-1  IEC:2011
The text of this standard is based on the following documents:
CDV Report on voting
35/1270/CDV 35/1274/RVC
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 in the IEC 60086 series, under the general title Primary batteries, can be
found 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.
60086-1  IEC:2011 – 7 –
INTRODUCTION
The technical content of this part of IEC 60086 provides fundamental requirements and
information on primary cells and batteries. All batteries within the IEC 60086 series are
considered dry cell batteries. In this sense, IEC 60086-1 is the main component of the
IEC 60086 series and forms the basis for the subsequent parts. For example, this part
includes elementary information on definitions, nomenclature, dimensions and marking. While
specific requirements are included, the content of this part tends to explain methodology (how)
and justification (why).
Over the years, this part has been changed to improve its content and remains under
continual scrutiny to ensure that the publication is kept up to date with the advances in both
battery and battery-powered device technologies.
NOTE Safety information is available in IEC 60086-4, IEC 60086-5 and IEC 62281.

– 8 – 60086-1  IEC:2011
PRIMARY BATTERIES –
Part 1: General
1 Scope
This part of IEC 60086 is intended to standardize primary batteries with respect to dimensions,
nomenclature, terminal configurations, markings, test methods, typical performance, safety
and environmental aspects.
As a primary battery classification tool, electrochemical systems are also standardized with
respect to system letter, electrodes, electrolyte, nominal and maximum open circuit voltage.
NOTE The requirements justifying the inclusion or the ongoing retention of batteries in the IEC 60086 series are
given in Annex A.
The object of IEC 60086-1 is to benefit primary battery users, device designers and battery
manufacturers by ensuring that batteries from different manufacturers are interchangeable
according to standard form, fit and function. Furthermore, to ensure compliance with the
above, this part specifies standard test methods for testing primary cells and batteries.
2 Normative references
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.
IEC 60086-2:2011, Primary batteries – Part 2: Physical and electrical specifications
IEC 60086-3:2011, Primary batteries – Part 3: Watch batteries
IEC 60086-4:2007, Primary batteries – Part 4: Safety of lithium batteries
IEC 60086-5:2011, Primary batteries – Part 5: Safety of batteries with aqueous electrolyte
IEC 60410, Sampling plans and procedures for inspection by attributes
ISO/IEC Directives, Part 1: Procedures for the technical work
ISO 3951(all parts, as applicable), Sampling procedures
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
application test
simulation of the actual use of a battery in a specific application

60086-1  IEC:2011 – 9 –
3.2
battery
one or more cells electrically connected by permanent means, fitted in a case, with terminals,
markings and protective devices etc., as necessary for use
[IEC 60050-482:2004, 482-01-04, modified]
3.3
button battery
small round battery, where the overall height is less than the diameter; batteries complying
with Figures 3 and 4 of IEC 60086-2
3.4
cell
basic functional unit, consisting of an assembly of electrodes, electrolyte, container, terminals
and usually separators, that is a source of electric energy obtained by direct conversion of
chemical energy
[IEC 60050-482:2004, 482-01-01]
3.5
closed-circuit voltage
CCV (abbreviation)
voltage across the terminals of a battery when it is on discharge
[IEC 60050-482:2004, 482-03-28, modified]
3.6
cylindrical (cell or battery)
cell or battery with a cylindrical shape in which the overall height is equal to or greater than
the diameter
[IEC 60050-482: 2004, 482-02-39, modified]
3.7
discharge (of a primary battery)
operation during which a battery delivers current to an external circuit
[IEC 60050-482:2004, 482-03-23, modified]
3.8
dry (primary) battery
primary battery in which the liquid electrolyte is essentially immobilized
[IEC 60050-482:2004, 482-04-14, modified]
3.9
effective internal resistance – DC method
The internal d.c. resistance of any electrochemical cell is defined by the following relation:
∆U (V)
R (Ω) =
i
∆i (A)
3.10
end-point voltage
EV (abbreviation)
specified voltage of a battery at which the battery discharge is terminated

– 10 – 60086-1  IEC:2011
[IEC 60050-482:2004, 482-03-30, modified]
3.11
leakage
unplanned escape of electrolyte, gas or other material from a cell or battery
[IEC 60050-482:2004, 482-02-32]
3.12
minimum average duration
MAD (abbreviation)
minimum average time on discharge which is met by a sample of batteries
NOTE The discharge test is carried out according to the specified methods or standards and designed to show
conformity with the standard applicable to the battery types.
3.13
nominal voltage (of a primary battery)
V (symbol)
n
suitable approximate value of the voltage used to designate or identify a cell, a battery or an
electrochemical system
[IEC 60050-482:2004, 482-03-31, modified]
3.14
open-circuit voltage
OCV (abbreviation)
voltage across the terminals of a battery when it is off discharge
[IEC 60050-482:2004, 482-03-32, modified]
3.15
primary (cell or battery)
cell or battery that is not designed to be electrically recharged
3.16
round (cell or battery)
cell or battery with circular cross section
3.17
service output (of a primary battery)
service life, or capacity, or energy output of a battery under specified conditions of discharge
3.18
service output test
test designed to measure the service output of a battery
NOTE A service output test may be prescribed, for example, when
a) an application test is too complex to replicate;
b) the duration of an application test would make it impractical for routine testing purposes .
3.19
small battery
cell or battery fitting within the limits of the truncated cylinder as defined in Figure 1

60086-1  IEC:2011 – 11 –
Dimensions in millimetres
+0,1
∅ 31,7
IEC  265/11
Figure 1 – Small cell or battery gauge (inner dimensions)
3.20
storage life
duration under specified conditions at the end of which a battery retains its ability to perform a
specified service output
[IEC 60050-482:2004, 482-03-47, modified]
3.21
terminals (of a primary battery)
conductive parts provided for the connection of a battery to external conductors
4 Requirements
4.1 General
4.1.1 Design
Primary batteries are sold mainly in consumer markets. In recent years, they have become
more sophisticated in both chemistry and construction, for example both capacity and rate
capability have increased to meet the growing demands from new, battery-powered
equipment technology.
When designing primary batteries, the aforementioned considerations shall be taken into
account. Specifically, their dimensional conformity and stability, their physical and electrical
performance and their safe operation under normal use and foreseeable mis-use conditions
shall be assured.
Additionally, information on equipment design can be found in Annex B.
4.1.2 Battery dimensions
The dimensions for individual types of batteries are given in IEC 60086-2 and IEC 60086-3.
4.1.3 Terminals
4.1.3.1 General
Terminals shall be in accordance with Clause 6 of IEC 60086-2.
+0,1
25,4
+0,1
57,1
– 12 – 60086-1  IEC:2011
Their physical shape shall be designed in such a way that they ensure that the batteries make
and maintain good electrical contact at all times.
They shall be made of materials that provide adequate electrical conductivity and corrosion
protection.
4.1.3.2 Contact pressure resistance
Where stated in the battery specification tables or the individual specification sheets in
IEC 60086-2, the following applies:
– a force of 10 N applied through a steel ball of 1 mm diameter at the centre of each contact
area for a period of 10 s shall not cause any apparent deformation which might prevent
satisfactory operation of the battery.
NOTE See also IEC 60086-3 for exceptions.
4.1.3.3 Cap and base
This type of terminal is used for batteries which have their dimensions specified according to
Figures 1 and 2 of IEC 60086-2 and which have the cylindrical side of the battery insulated
from the terminals.
4.1.3.4 Cap and case
This type of terminal is used for batteries which have their dimensions specified according to
Figures 3 and 4 of IEC 60086-2, but in which the cylindrical side of the battery forms part of
the positive terminal.
4.1.3.5 Screw terminals
This contact consists of a threaded rod in combination with either a metal or insulated metal
nut.
4.1.3.6 Flat contacts
These are essentially flat metal surfaces adapted to make electrical contact by suitable
contact mechanisms bearing against them.
4.1.3.7 Flat or spiral springs
These contacts comprise flat metal strips or spirally wound wires which are in a form that
provides pressure contact.
4.1.3.8 Plug-in-sockets
These are made up of a suitable assembly of metal contacts, mounted in an insulated housing
or holding device and adapted to receive corresponding pins of a mating plug.
4.1.3.9 Snap fasteners
4.1.3.9.1 General
These contacts are composed of a combination comprising a stud (non-resilient) for the
positive terminal and a socket (resilient) for the negative terminal.
They shall be of suitable metal so as to provide efficient electrical connection when joined to
the corresponding parts of an external circuit.

60086-1  IEC:2011 – 13 –
4.1.3.9.2 Spacing of contacts
The spacing between the stud and socket is given in the following table, and applies from
centre to centre. The stud always forms the positive connection and the socket the negative
connection on the battery (see Table 1).
Table 1 – Spacing of contacts
Nominal voltage Standard Miniature
V mm mm
35 ± 0,4 12,7 ± 0,25
4.1.3.9.3 Non-resilient snap fastener connectors (studs)
All dimensions not specified are free. The shape of the studs shall be chosen so that they
conform to the dimensions specified (see Figure 2 and Table 2).
a
r
r
b
IEC  2218/06
Figure 2 – Stud
Table 2 – Snap fastener connectors
Standard Miniature
mm mm
a 7,16 ± 0,05 5,72 ± 0,05
b
+0,07
5,38 ± 0,05
6,65
−0,05
c
3,20 ± 0,1 3,00 ± 0,1
d
2,67 ± 0,05 2,54 ± 0,05
r
+0,05 +0,1
0,61 0,9
−0,08 −0,3
r
+0,3 +0,2
0,4 0,3
0 0
4.1.3.9.4 Resilient snap fastener connectors (sockets)
Dimensions and requirements:
The dimensions of the resilient (socket) parts of snap fastener connectors are not specified as
such. The properties shall be such that
a) the resiliency ensures that the standardized studs can be properly mated,
b) good electrical contact is maintained.
c
d
– 14 – 60086-1  IEC:2011
4.1.3.10 Wire
Wire leads shall be single or multi-strand flexible insulated tinned copper. The insulation may
be cotton braid or suitable plastic. The positive terminal wire covering shall be red and the
negative black.
4.1.3.11 Other spring contacts or clips
These contacts are generally used on batteries when the corresponding parts of the external
circuit are not precisely known. They shall be of spring brass or of other material having
similar properties.
4.1.4 Classification (electrochemical system)
Primary batteries are classified according to their electrochemical system.
Each system, with the exception of the zinc-ammonium chloride, zinc chloride-manganese
dioxide system, has been allocated a letter denoting the particular system.
The electrochemical systems that have been standardized up to now are given in Table 3.
Table 3 – Standardized electrochemical systems
Nominal Maximum
Negative voltage open circuit
Letter Electrolyte Positive electrode
electrode voltage
V V
No letter Zinc(Zn) Ammonium chloride, Manganese dioxide (MnO ) 1,5 1,73
Zinc chloride
A Zinc (Zn) Ammonium chloride, Oxygen (O ) 1,4 1,55
Zinc chloride
B Lithium (Li) Organic electrolyte Carbon monofluoride (CF) 3,0 3,7
x
C Lithium (Li) Organic electrolyte Manganese dioxide (MnO ) 3,0 3,7
E Lithium (Li) Non-aqueous Thionyl chloride (SOCl ) 3,6 3,9
inorganic
F Lithium (Li) Organic electrolyte Iron disulfide (FeS ) 1,5 1,83
G Lithium (Li) Organic electrolyte Copper (II) oxide (CuO) 1,5 2,3
L Zinc (Zn) Alkali metal hydroxide Manganese dioxide (MnO ) 1,5 1,68
P Zinc (Zn) Alkali metal hydroxide Oxygen (O ) 1,4 1,59
S Zinc (Zn) Alkali metal hydroxide Silver oxide (Ag O) 1,55 1,63
W Lithium (Li) Organic electrolyte Sulphur dioxide (SO ) 3,0 3,05
Y Lithium (Li) Non-aqueous Sulfuryl chloride (SO Cl ) 3,9 4,1
2 2
inorganic
Z Zinc (Zn) Alkali metal hydroxide Nickel oxyhydroxide (NiOOH) 1,5 1,78
NOTE 1 The value of the nominal voltage is not verifiable; therefore it is only given as a reference.
NOTE 2 The maximum open-circuit voltage (3.14) is measured as defined in 5.5 and 6.8.1.
NOTE 3 When referring to an electrochemical system, common protocol is to list negative electrode first,
followed by positive electrode, i.e. lithium-iron disulfide.
4.1.5 Designation
The designation of primary batteries is based on their physical parameters, their
electrochemical system as well as modifiers, if needed.

60086-1  IEC:2011 – 15 –
A comprehensive explanation of the designation system (nomenclature) can be found in
Annex C.
4.1.6 Marking
4.1.6.1 General (see Table 4)
With the exception of small batteries (see 4.1.6.2), each battery shall be marked with the
following information:
a) designation, IEC or common;
b) expiration of a recommended usage period or year and month or week of manufacture.
The year and month or week of manufacture may be in code;
c) polarity of the positive (+) terminal;
d) nominal voltage;
e) name or trade mark of the manufacturer or supplier;
f) cautionary advice.
NOTE Examples of the common designations can be found in Annex D of IEC 60086-2.
4.1.6.2 Marking of small batteries (see Table 4)
a) Batteries designated in IEC as small, mainly category 3 and category 4 batteries have a
surface too small to accommodate all markings shown in 4.1.6.1. For these batteries the
designation 4.1.6.1a) and the polarity 4.1.6.1c) shall be marked on the battery. All other
markings shown in 4.1.6.1 may be given on the immediate packing instead of on the
battery.
b) For P-system batteries, 4.1.6.1a) may be on the battery, the sealing tab or the
package.4.1.6.1c) may be marked on the sealing tab and/or on the battery. 4.1.6.1b),
4.1.6.1d) and 4.1.6.1e) may be given on the immediate packing instead of on the battery.
c) Caution for ingestion of swallowable batteries shall be given. Refer to IEC 60086-4 (7.2 m)
and 9.2) and IEC 60086-5 (7.1 l) and 9.2) for details.
Table 4 – Marking requirements

Small batteries
Batteries with
Marking the exception of
P-system
small batteries
batteries
a) Designation, IEC or common A A C
b) Expiration of a recommended usage period or
year and month or week of manufacture. The
A B B
year and month or week of manufacture may be
in code
c) Polarity of the positive (+) terminal A A D
d) Nominal voltage A B B
e) Name or trade mark of the manufacturer or
A B B
supplier
a a
f) Cautionary advice A B B
A: shall be marked on the battery
B: may be marked on the immediate packing instead on the battery
C: may be marked on the battery, the sealing tab or the immediate packing
D: may be marked on the sealing tab and/or on the battery
a
Caution for ingestion of swallowable batteries shall be given. Refer to IEC 60086-4 (7.2m) and 9.2) and
IEC 60086-5 (7.1l) and 9.2) for details.

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4.1.6.3 Marking of batteries regarding method of disposal
Marking of batteries with respect to the method of disposal shall be in accordance with local
legal requirements.
4.1.7 Interchangeability: battery voltage
Primary batteries as presently standardized in the IEC 60086 series can be categorized by
1)
their standard discharge voltage U . For a new battery system, its interchangeability by
s
voltage is assessed for compliance with the following formula:
n × 0,85 U ≤ m × U ≤ n × 1,15 U
r s r
where
n is the number of cells connected in series, based on reference voltage U ;
r
m is the number of cells connected in series, based on standard discharge voltage U .
s
Currently, two voltage ranges that conform to the above formula have been identified. They
are identified by reference voltage U , which is the midpoint of the relevant voltage range.
r
Voltage range 1, U = 1,4 V: Batteries having a standard discharge voltage m × U equal to or
r s
within the range of n × 1,19 V to n × 1,61 V.
Voltage range 2, U = 3,2 V: Batteries having a standard discharge voltage m × U equal to or
s
r
within the range of n × 2,72 V to n × 3,68 V.
The term standard discharge voltage and related quantities, as well as the methods of their
determination, are given in Annex F.
NOTE For single-cell batteries and for multi-cell batteries assembled with cells of the same voltage range, m and
n will be identical; m and n will be different for multi-cell batteries if assembled with cells from a different voltage
range than those of an already standardized battery.
Voltage range 1 encompasses all presently standardized batteries with a nominal voltage of
about 1,5 V, i.e. "no-letter" system, systems A, F, G, L, P, S and Z.
Voltage range 2 encompasses all presently standardized batteries with a nominal voltage of
about 3 V, i.e. systems B, C and E.
Because batteries from voltage range 1 and voltage range 2 show significantly different
discharge voltages, they shall be designed to be physically non-interchangeable. Before
standardizing a new electrochemical system, its standard discharge voltage shall be
determined in accordance with the procedure given in Annex F to resolve its
interchangeability by voltage.
WARNING Failure to comply with this requirement can present safety hazards to the user, such as fire, explosion,
leakage and/or device damage. This requirement is necessary for safety and operational reasons.
4.2 Performance
4.2.1 Discharge performance
Discharge performance of primary batteries is specified in IEC 60086-2.
———————
1)
The standard discharge voltage U was introduced to comply with the principle of experimental verifiability.
s
Neither the nominal voltage nor the maximum off-load voltage complies with this requirement.

60086-1  IEC:2011 – 17 –
4.2.2 Dimensional stability
The dimensions of batteries shall conform with the relevant specified dimensions as given in
IEC 60086-2 and IEC 60086-3 at all times during discharge testing under the standard
conditions given in this specification.
NOTE 1 An increase in battery height of 0,25 mm can occur with button cells of the B, C, G, L, P and S systems,
if discharged below end-point voltage.
NOTE 2 For certain button cells (coin cells) of the C and B systems, a decrease in battery height may occur as
discharge continues.
4.2.3 Leakage
When batteries are stored and discharged under the standard conditions given in this
specification, no leakage shall occur.
4.2.4 Open-circuit voltage limits
The maximum open-circuit voltage of batteries shall not exceed the values given in Table 3 in
4.1.4.
4.2.5 Service output
Discharge durations, initial and delayed, of batteries shall meet the requirements given in
IEC 60086-2.
4.2.6 Safety
When designing primary batteries, safety under conditions of intended use and foreseeable
mis-use as prescribed in IEC 60086-4 and IEC 60086-5 shall be considered.
5 Performance – Testing
5.1 General
For the preparation of standard methods of measuring performance (SMMP) of consumer
goods, refer to Annex G.
5.2 Discharge testing
5.2.1 General
The discharge tests in this standard fall into two categories:
– application tests;
– service output tests.
In both categories of tests, discharge loads are specified in accordance with 6.4.
The methods of determining the load and test conditions are as follows.
5.2.2 Application tests
5.2.2.1 General
a) The equivalent resistance is calculated from the average current and average operating
voltage of the equipment under load.

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b) The functional end-point voltage and the equivalent resistance value are obtained from the
data on all the equipment measured.
c) The median class defines the resistance value and the end-point voltage to be used for
the discharge test.
d) If the data are concentrated in two or more widely separated groups, more than one test
may be required.
e) In selecting the daily discharge period, the total weekly usage of the equipment is
considered.
The daily period then becomes the nearest preferred value (see 6.5) to one-seventh of the
total weekly usage.
NOTE 1 Some fixed resistance tests have been chosen to permit simplicity of design and ensure reliability of the
test equipment, despite the fact that, in specific instances, constant current or constant wattage tests may be a
better representation of the application.
In the future, alternative load conditions may become unavoidable. It is also inevitable that the
load characteristics of a particular category of equipment will change with time in a
developing technology.
The precise determination of the functional end-point voltage of the equipment is not always
possible. The discharge conditions are at best a compromise selected to represent a category
of equipment which may have widely divergent characteristics.
Nevertheless, in spite of these limitations, the derived application test is the best approach
known for the estimation of battery capability for a particular category of equipment.
NOTE 2 In order to minimize the proliferation of application tests, the tests specified should be those accounting
for 80 % of the market by battery designation.
5.2.2.2 Application tests with multiple loads
For application test with multiple loads, the load order during a cycle shall start with the
heaviest load and move to the lightest load unless otherwise specified.
5.2.3 Service output tests
For service output tests, the value of the load resistor should be selected such that the
service output approximates 30 days.
When full capacity is not realized within the required time scale, the service output may be
extended to the shortest suitable duration thereafter by selecting a discharge load of higher
ohmic value, as defined in 6.4.
5.3 Conformance check to a specified minimum average duration
In order to check the conformance of a battery, any of the application tests or servic
...