prEN IEC 62133-2:2026

Safety requirements for portable sealed secondary cells, and for batteries made from them, for use in portable applications - Part 2: Lithium systems

Accumulateurs alcalins et autres accumulateurs à électrolyte non acide - Exigences de sécurité pour les accumulateurs portables étanches, et pour les batteries qui en sont constituées, destinés à l'utilisation dans des applications portables - Partie 2: Systèmes au lithium

Sekundarni členi in baterije z alkalnimi ali drugimi nekislinskimi elektroliti - Varnostne zahteve za prenosne zatesnjene sekundarne litijeve člene in za baterije, narejene iz njih, za uporabo v prenosnih napravah - 2. del: Litijevi sistemi

General Information

• Status: Not Published
• Publication Date: 27-Sep-2027
• ICS: 29.220.30 - Alkaline secondary cells and batteries
• Technical Committee: CLC/TC 21X - Secondary cells and batteries
• Current Stage: 4060 - Enquiry results established and sent to TC, SR, BTTF - Enquiry
• Start Date: 29-May-2026
• Completion Date: 29-May-2026
• Ref Project: oSIST prEN IEC 62133-2:2026 - Secondary cells and batteries containing alkaline or other non-acid electrolytes - Safety requirements for portable sealed secondary lithium cells, and for batteries made from them, for use in portable applications - Part 2: Lithium systems

Relations

• Revises: EN 62133-2:2017/A1:2021/AC:2022-01 - 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 2: Lithium systems
• Effective Date: 10-Oct-2023
• Revises: EN 62133-2:2017/A1:2021 - 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 2: Lithium systems
• Effective Date: 10-Oct-2023
• Revises: EN 62133-2:2017 - 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 2: Lithium systems
• Effective Date: 10-Oct-2023

Overview

prEN IEC 62133-2:2026 provides internationally recognized safety requirements for secondary lithium cells and batteries containing alkaline or other non-acid electrolytes intended for use in portable sealed applications. Developed by the International Electrotechnical Commission (IEC) and adopted by CENELEC (CLC), this standard is a key reference for manufacturers, product designers, and conformity assessment bodies involved in lithium battery technology. It addresses critical aspects of safety performance, testing, and marking to minimize risks related to the use, handling, and storage of lithium cells and batteries in devices such as smartphones, laptops, power tools, and other portable electronic equipment.

Key Topics

• General safety requirements: The standard details the fundamental safety considerations for design, construction, and operation of portable sealed secondary lithium cells and batteries.
• Testing and compliance: Specific type tests and sample size recommendations are outlined to evaluate battery safety under intended use and foreseeable misuse.
• Marking and instructions: Requirements ensure safety information and warnings are clearly communicated to users and equipment integrators, including marking details for small batteries with ingestion hazards.
• Manufacturing quality: The document emphasizes the implementation of manufacturing quality plans to maintain safe and consistent cell and battery production.
• Environmental and abuse conditions: It covers resistance to environmental influences such as high temperatures, vibration, mechanical shock, and electrostatic discharge (ESD).
• Foreseeable misuse scenarios: The standard includes tests for hazards like external and internal short circuits, overcharging, overdischarging, thermal abuse, and mechanical impact.

Applications

prEN IEC 62133-2:2026 is fundamental for ensuring battery safety in a wide range of portable applications:

• Hand-held electronics: Smartphones, tablets, wearable devices, audio/video players
• Transportable and movable equipment: Laptops, portable power tools, business-use video cameras, and other equipment not fixed in place
• Consumer electronics: Devices powered by lithium-ion or lithium-polymer batteries that must remain safe despite daily handling, variable environmental conditions, or user mishandling

The standard is directly referenced in product safety assessments, certification processes, and as a basis for regulatory compliance in markets that require recognized lithium battery standards. It is essential for battery pack assemblers, OEM device manufacturers, and component suppliers integrating lithium battery systems into portable products.

Related Standards

prEN IEC 62133-2:2026 aligns and interacts with several other key standards, which address detailed testing, marking, and safety considerations for lithium batteries:

• IEC 61960-3/4: Secondary lithium cells and batteries, covering prismatic, cylindrical, and coin cells
• IEC 60086-4: Safety of lithium primary batteries, including guidelines for ingestion risk
• IEC 62619 & IEC 62660-3: Safety requirements for lithium batteries used in industrial and vehicle propulsion applications
• IEC 62281: Safety during transport for lithium cells and batteries
• IEC 61000-4-2: Electrostatic discharge immunity test
• ISO/IEC Guide 51: General guidelines for including safety aspects in standards

Practical Value

Implementing prEN IEC 62133-2:2026 enhances product safety and reliability, reduces the risk of hazardous battery failures, and facilitates easier market access by demonstrating compliance with international safety expectations. The standard is a critical tool for:

• Product designers wishing to ensure safe integration of lithium batteries in portable devices
• Manufacturers seeking effective risk mitigation and robust safety documentation
• Certification and compliance teams requiring harmonized criteria for testing and auditing

By applying this standard, stakeholders ensure that secondary lithium batteries meet stringent requirements related to abuse tolerance, quality, labeling, and safe end-user operation, thereby supporting the development of safer, more trustworthy portable electronic products.

Keywords: lithium battery safety, IEC 62133-2, portable secondary lithium batteries, battery standards, safety requirements, battery testing, CLC, product compliance, portable device safety, lithium-ion battery.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2026
Sekundarni členi in baterije z alkalnimi ali drugimi nekislinskimi elektroliti -
Varnostne zahteve za prenosne zatesnjene sekundarne litijeve člene in za baterije,
narejene iz njih, za uporabo v prenosnih napravah - 2. del: Litijevi sistemi
Secondary cells and batteries containing alkaline or other non-acid electrolytes - Safety
requirements for portable sealed secondary lithium cells, and for batteries made from
them, for use in portable applications - Part 2: Lithium systems
Safety requirements for portable sealed secondary cells, and for batteries made from
them, for use in portable applications - Part 2: Lithium systems
Accumulateurs alcalins et autres accumulateurs à électrolyte non acide - Exigences de
sécurité pour les accumulateurs portables étanches, et pour les batteries qui en sont
constituées, destinés à l'utilisation dans des applications portables - Partie 2: Systèmes
au lithium
Ta slovenski standard je istoveten z: prEN IEC 62133-2:2026
ICS:
29.220.30 Alkalni sekundarni členi in Alkaline secondary cells and
baterije batteries
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

21A/970/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 62133-2 ED2
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-03-06 2026-05-29
SUPERSEDES DOCUMENTS:
21A/928/CD, 21A/942A/CC
IEC SC 21A : SECONDARY CELLS AND BATTERIES CONTAINING ALKALINE OR OTHER NON-ACID ELECTROLYTES
SECRETARIAT: SECRETARY:
France Mr Jean-Marie Bodet
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

TC 21
ASPECTS CONCERNED:
Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is
the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Secondary cells and batteries containing alkaline or other non-acid electrolytes - Safety
requirements for portable sealed secondary lithium cells, and for batteries made from them,
for use in portable applications - Part 2: Lithium systems

PROPOSED STABILITY DATE: 2027
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IEC CDV 62133-2 © IEC 2026
CONTENTS
Contact . 3
CONTENTS . 4
FOREWORD . 7
1 Scope . 11
2 Normative references . 12
3 Terms and definitions . 13
4 Parameter measurement tolerances . 17
5 General safety considerations . 17
5.1 General (cells and batteries) . 17
5.1.1 General . 17
5.1.2 Pressure relief . 18
5.1.3 Terminal contacts . 18
5.1.4 Manufacturing quality plan . 18
5.1.5 Information . 18
5.2 Cells . 19
5.3 Batteries . 19
5.3.1 General . 19
5.3.2 Wiring . 19
6 Type test and sample size . 19
7 Specific requirements and tests . 21
7.1 General . 21
7.2 Charging procedures for test purposes . 21
7.2.1 General . 21
7.2.2 First procedure . 22
7.2.3 Second procedure . 22
7.3 Excessive mass loss . 23
7.4 Intended use . 23
7.4.1 Continuous charging at constant voltage (cell) . 23
7.4.2 Case stress at high ambient temperature (battery) . 24
7.4.3 Electrostatic discharge (ESD) immunity (battery) . 24
7.4.4 Risk evaluation after cycling at temperature extremes (cell) . 25
7.4.5 Vibration . 25
7.4.6 Mechanical shock . 26
7.5 Reasonably foreseeable misuse. 27
7.5.1 External short-circuit (cell) . 27
7.5.2 External short-circuit (battery) . 27
7.5.3 Free fall . 28
7.5.4 Thermal abuse (cell) . 29
7.5.5 Crush (cell) . 29
7.5.6 Abnormal charging. 29
7.5.7 Forced discharge (cell) . 31
7.5.8 Overdischarge (battery) . 32
7.5.9 Design evaluation - Internal short-circuit (cell) . 32
8 Information for safety . 35
8.1 General . 35
8.2 Safety information for swallowable cells and batteries . 35
IEC CDV 62133-2 © IEC 2026
8.3 Other information . 36
9 Marking . 36
9.1 Cell marking. 36
9.2 Battery marking . 36
9.3 Caution for ingestion of swallowable cells and batteries . 37
10 Packaging and transport . 37
Annex A (informative) An explanation of the safe operating region for charging and
discharging secondary lithium-ion cells . 38
A.1 General . 38
A.2 Safety of lithium-ion secondary battery . 38
A.3 Consideration of charging voltage . 38
A.3.1 General . 38
A.3.2 Upper limit charging voltage . 38
A.4 Consideration of charging temperature and current . 40
A.4.1 General . 40
A.4.2 Standard charging temperature range (T to T ) . 40
2 3
A.4.3 High charging temperature range (T to T ) . 40
3 4
A.4.4 Low charging temperature range (T to T ) . 41
1 2
A.4.5 Specifying new values for charging voltage and temperature ranges . 42
A.4.6 Consideration of discharge . 44
A.4.7 Evaluation in the end-use equipment . 45
Annex B (normative) Preparation for test of 7.5.9.2 . 46
B.1 Sample preparation for the forced internal short-circuit test of 7.5.9.2 . 46
B.1.1 General . 46
B.1.2 Insertion procedure for nickel particle to generate internal short . 46
B.1.3 Disassembly of charged cell . 46
B.1.4 Shape of nickel particle . 46
B.1.5 Insertion of nickel particle in cylindrical cell . 46
B.1.6 Insertion of nickel particle in prismatic cell . 49
B.1.7 Experimental procedure of the forced internal short-circuit test . 51
B.2 Recommended specifications for the pressing device . 54
Annex C (informative) Recommendations for the design of batteries and end-use
equipment incorporating cells . 56
C.1 General . 56
C.2 Electrical . 56
C.3 Mechanical protection for cells and components of batteries . 56
C.4 The control of voltages under charge and discharge . 56
C.5 Safety analysis . 57
C.6 Additional recommendations to end-use equipment manufacturers and
battery assemblers . 57
Annex D (informative) Recommendations to be provided to the end-users . 59
Annex E (normative) Measurement of the internal AC resistance . 60
E.1 General . 60
E.2 Method . 60
Annex F (informative) Packaging and transport . 61
Annex G (informative) Component standards references . 62
Annex H (informative) Cell construction requirements . 63
Annex I (informative) Cell and battery specification sheet . 64
IEC CDV 62133-2 © IEC 2026
I.1 General . 64
I.2 Cell specifications . 64
I.3 Battery specifications . 66
Annex J (normative) Alternative internal short-circuit test approach . 69
Bibliography . 70

Figure 1 – Forced discharge time chart . 31
Figure 2 – Jig for pressing . 34
Figure 3 – Ingestion gauge . 36
Figure A.1 – Example of Schematic of lithium-ion cell operating region for charging . 39
Figure A.2 – Schematic of lithium-ion cell operating region for discharging . 44
Figure B.1 – Shape of nickel particle . 46
Figure B.2 – Nickel particle insertion position between positive and negative active
material (coated) area of cylindrical cell . 47
Figure B.3 – Nickel particle insertion position between positive aluminium foil
(uncoated) area and negative active material (coated) area of cylindrical cell . 47
Figure B.4 – Disassembly of cylindrical cell . 48
Figure B.5 – Nickel particle insertion position between positive and negative active
material (coated) area of prismatic cell . 49
Figure B.6 – Nickel particle insertion position between positive aluminium foil
(uncoated) area and negative active material (coated) area of prismatic cell . 50
Figure B.7 – Disassembly of prismatic cell . 51
Figure B.8 – Dimensions of a completed nickel particle. 52
Figure B.9 – Positioning of the nickel particle when it cannot be placed in the specified
area 53
Figure B.10 – Cylindrical cell . 53
Figure B.11 – Distance / time ratio of several types of pressing devices . 55

Table 1 – Classification of cells to which the tests are applied . 19
Table 2 – Sample size and temperatures for type tests . 20
Table 3 – Condition of charging procedure . 22
Table 4 – Mass loss limits . 23
Table 5 – Test levels. 24
Table 6 – Conditions for vibration test . 26
Table 7 – Shock parameters . 26
Table 8 – High rate charging test condition . 30
Table 9 – Forced internal short-circuit test temperatures . 34
Table A.1 – Examples of upper limit charging voltage and standard charging
temperature range . 39
Table B.1 – Recommended specifications of a pressing device . 55
Table G.1 – Example component standard references . 62
Table I.1 – Example of cell information and parameter . 64
Table I.2 – Example of charging and discharging profile of cell . 65
Table I.3 – Example of battery information and parameter . 66
Table I.4 – Example of charging and discharging profile of battery . 67
IEC CDV 62133-2 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Secondary cells and batteries containing alkaline or other non-acid
electrolytes - Safety requirements for portable sealed secondary lithium
cells, and for batteries made from them, for use in portable applications -
Part 2: Lithium systems
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for
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way in which they are used or for any misinterpretation by any end user.
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IEC is not responsible for any services carried out by independent certification bodies.
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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) IEC draws attention to the possibility that the implementation of this document may involve
the use of (a) patent(s). IEC takes no position concerning the evidence, validity or applicability
IEC CDV 62133-2 © IEC 2026
of any claimed patent rights in respect thereof. As of the date of publication of this document,
IEC [had/had not] received notice of (a) patent(s), which may be required to implement this
document. However, implementers are cautioned that this may not represent the latest
information, which may be obtained from the patent database available at https://patents.iec.ch.
IEC shall not be held responsible for identifying any or all such patent rights.
IEC 62133-2 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. It is an International Standard.
This second edition cancels and replaces the first edition of IEC 62133-2 published in 2017.
This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to IEC 62133 -2:
a) Clause 1: The scope was revised to indicate that the standard addresses batteries built into
equipment unless otherwise noted that the batteries are user-replaceable. The scope also
indicates that electric shock hazards are not addressed in the standard.
b) Clause 2: The referenced documents were updated to represent current referenced
standards.
c) Clause 3: A number of new terms that are in the standard have been added to this clause.
d) Clause 5: The contents of Clause 5 contain only those statements that are mandatory. All
non-mandatory language previously located in Clause 5 was moved to Annex C
(Informative) Recommendations to equipment manufacturers and battery assemblers.
Clause 5 was also organized into General, Cell and Battery subclauses. Removal of
insulation resistance criteria, which did not seem relevant to portable lithium-ion batteries.
As part of these changes a new normative Annex H has been included for cell construction
criteria.
e) Clause 6: Added cells with a rated capacity less than 300 mAh and resistances greater than
3 Ω as option for no further testing. Also added process for evaluating families of cells and
batteries similar to what is in the UN lithium battery transport criteria of 38 .3.
f) 7.1: Table 3 was updated to reflect changes to tests, etc. The second charging procedure
was updated to better reflect how charging using the operating region specifications should
be handled. Also, clarification that the temperatures of the operating region is a surf ace
temperature.
g) 7.4 (foreseeable use tests): The following tests were added to the foreseeable use tests:
7.4.3 Electrostatic discharge (ESD) immunity (battery); 7.4.4 Risk evaluation after cycling
at temperature extremes (cell). 7.4.3 Electrostatic discharge (ESD) immunity (battery) test
was taken from IEC 61960-3:2017. 7.4.4 Risk evaluation after cycling at temperature
extremes (cell) test was added to determine that cells subjected to operating region extreme
temperature conditions remain safe. Also, since Vibration and Mechanical shock tests
represent normal use conditions, these tests were moved to 7.4.
h) 7.5 (foreseeable misuse tests): There were a number of changes made to the tests that are
under the foreseeable misuse test subclause as follows:
1) External Short-circuit (cell) - Revised external short-circuit parameters to 30 mΩ ± 10
mΩ for high current discharge cells. Also conditioning temperature was changed to 57
°C ± 4 °C to match IEC 62281:2019/AMD2:2023 criteria.
2) External Short-circuit (battery) - Revised external short-circuit parameters to 30 mΩ ±
10 mΩ for high current discharge batteries. Also, the single fault condition is limited to
user-replaceable batteries.
3) Abnormal Charging - Divided into overcharge and high rate abnormal charge test.
i) Overvoltage charging test - Expanded to include cells and with test parameters
modified based upon what is being tested (i.e. cell, battery with overcharge
protection and battery without protection).
IEC CDV 62133-2 © IEC 2026
ii) High rate charging test - Added to evaluate cells and batteries ability to handle some
level of overcurrent charging. This test also varies depending upon what is being
tested (cell, battery and battery with parallel string).
4) Overdischarge (battery) - Added to evaluate the effectiveness of a batteries
overdischarge protection.
5) Internal Short-circuit 7.5.9: Completely re-written to offer choices to the forced internal
short-circuit test. It now contains the forced internal short-circuit test, which has been
re-organized for clarity; An alternative internal short-circuit test was added. This option
has criteria taken from a similar option in IEC 62660-3:2022. The details that the test
would need to meet are included in normative Annex J. There is also an option to testing,
which consists of construction criteria (puncture strength or separator melt temperature
criteria) and additional production verification. These other options are proposed so that
the country deviations that had been in the standard when only the forced internal short-
circuit test was included were removed.
i) Clause 8: Revised and re-organized. Included was specifics on safe charging including the
use of designated chargers that should be included in the information for safety and the
manufacturer providing the necessary specifications.
j) Clause 9: Updated to help simplify this clause including reference to IEC 61960-3:2017 and
IEC 61960-4:2024 marking criteria and updates to the small battery marking. For small
batteries that can be a potential ingestion hazard, IEC 60086-4:2025.
k) Annex A: Annex A was made informative. The forced internal short-circuit sample
preparation was moved out of Annex A and into Annex B. The whole clause was revised
and reorganized to improve clarity and to make clear that the cell manufacturer is the one
that has to specific the operating region.
l) Annex B: This annex is normative and contains the forced internal short-circuit sample
preparation clause. It is normative.
m) Annex C: This informative annex was renamed and the non-enforceable guidance language
that was in Clause 5 was moved here. Also there have been modification so Clause C.6 to
better represent lithium-ion technology concerns.
n) Annex D: This informative annex was revised to better reflect lithium-ion technology
concerns.
o) Annex E: This is now the normative criteria for resistance testing of coin cells and now other
small cells, which may not have to be tested.
p) Annex G: Revised to clarify standards of safety components to include not only IEC but
regional component standards.
q) Annex H: This is a new normative annex for minimum cell safety criteria related to production
that can impact safety. This annex applies to all cells.
r) Annex I: This is a new informative annex about cell and battery specifications. This is
information that cell and battery manufacturers should be providing for the safe use of their
devices.
s) Annex J: This is a new normative annex for criteria for an alternative internal short -circuit
as an option to doing the forced internal short-circuit test or utilizing the construction criteria
option. This criteria is very similar to that provided in IEC 62660-3:2022 as criteria to be
applied if an alternative test is to be conducted.
The text of this standard is based on the following documents:
Draft Report on voting
21A/XXX/XX 21A/XXX/XX
Full information on the voting for its approval 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.
IEC CDV 62133-2 © IEC 2026
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/publications.
A list of all parts of the IEC 62133 series, published under the general title 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 , 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 webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
IEC CDV 62133-2 © IEC 2026
1 Scope
This part of IEC 62133 specifies requirements and tests for the safe operation of portable sealed
secondary lithium cells and batteries containing non-acid electrolyte, under intended use and
reasonably foreseeable misuse.
This standard establishes minimum requirements for susceptibility of cells, and batteries to the
abuse and environmental effects that these cells and batteries may encounter in handling,
transport and storage, but does not presume to account for these effects in specific applications,
which are left to the requirements of the combination of the battery and end -use equipment in
the end-use equipment standards.
Coin cells with an internal resistance greater than 3 Ω measured in accordance with IEC 61960-
4:2024, 6.6, and batteries made from them are out of the scope of this document. The
instructions for preventing accidental ingestion of those coin cells and batt eries are specified in
IEC 60086-4:2025, 7.2.
This standard does not address functional safety of the electronic and programmable electronic
battery controls.
This standard addresses first life cells and batteries. In the case of reused, repurposed or
second life secondary lithium cells and batteries, additional requirements and tests should be
considered.
In addition to the requirements explicitly outlined in this standard including markings and
instructions, it is essential to consider other potential safety risks that cannot be fully addressed.
These include, but are not limited to, hazardous voltage exposure, flammability risks for non-
metallic materials, and other application-specific safety concerns.
Compliance to this standard alone cannot be sufficient for safe integration of a cell or battery
in the end-use equipment if only the cells or batteries comply with this standard with no
additional evaluation.
NOTE 1 Annex C of this standard provides guidance for further considerations when battery specific criteria are not
covered in the end-use equipment standard.
Portable applications comprise hand-held equipment, transportable equipment and movable
equipment.
Examples of the main uses are shown below:
a) hand-held equipment: smartphone, tablet PCs, audio/video players, and similar equipment;
b) transportable equipment: notebook computers, CD players, and similar equipment;
c) movable equipment
1) 18 kg or less in mass and not fixed in place, or
2) provided with wheels, castors, or other means to facilitate movement by an ordinary
person as required to perform its intended use,
3) power tools, power assisted cycles, business-use video cameras, and similar equipment.
NOTE 2 EESS (Electrical Energy Storage Systems) and UPS, which use batteries over 500 Wh of electric energy
are excluded.
NOTE 3 Self-propelled vehicles are excluded
IEC CDV 62133-2 © IEC 2026
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 - Part 482: Primary and
secondary cells and batteries (available at http://www.electropedia.org)
IEC 60086-4:2025, Primary batteries - Part 4: Safety of lithium batteries
IEC 60269-7:2021, Low-voltage fuses - Part 7: Supplementary requirements for fuse-links for
the protection of batteries and battery systems
IEC 60691:2023, Thermal-links - Requirements and application guide
IEC 60730-1:2022, Automatic electrical controls - Part 1: General requirements
IEC 60738-1:2022, Thermistors - Directly heated positive temperature coefficient - Part 1:
Generic specification
IEC 61000-4-2:2025, Electromagnetic Compatibility (EMC) - Part 4-2: Testing and
measurement techniques - Electrostatic discharge immunity test
IEC 61434:1996, Secondary cells and batteries containing alkaline or other non-acid
electrolytes - Guide to designation of current in alkaline secondary cell and battery standards
IEC 61960-3:2017, Secondary cells and batteries containing alkaline or other non-acid
electrolytes - Secondary lithium cells and batteries for portable applications - Part 3: Prismatic
and cylindrical lithium secondary cells and batteries made from them
IEC 61960-4:2024, Secondary cells and batteries containing alkaline or other non-acid
electrolytes - secondary lithium cells and batteries for portable applications - Part 4: Coin
secondary lithium cells, and batteries made from them
IEC 62133-2, 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 2: Lithium systems
IEC 62281:2019/AMD2:2023, Safety of primary and secondary lithium cells and batteries during
transport
IEC 62619:2022, Secondary cells and batteries containing alkaline or other non-acid
electrolytes - Safety requirements for secondary lithium cells and batteries, for use in industrial
applications
IEC 62660-3:2022, Secondary lithium-ion cells for the propulsion of electric road vehicles - Part
3: Safety requirements
ISO/IEC Guide 51, Safety aspects - Guidelines for their inclusion in standards
ISO 6208:1992, Nickel and nickel alloy plate, sheet and strip
ISO 8124-1:2022, Safety of toys — Part 1: Safety aspects related to mechanical and physical
properties
IEC CDV 62133-2 © IEC 2026
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-482:2004,
ISO/IEC Guide 51 and the following apply.
3.1
safety
freedom from unacceptable risk
3.2
risk
combination of the probability of occurrence of harm and the severity of that harm
3.3
harm
physical injury or damage to the health of people or damage to property or to the environment
3.4
hazard
potential source of harm
3.5
intended use
use of a product, process or service in accordance with specifications, instructions and
information provided by the supplier
3.6
reasonably foreseeable misuse
use of a product, process or service in a way which is not intended by the supplier, but which
may result from readily predictable human behaviour
3.7
secondary lithium cell
cell
secondary cell where electrical energy is derived from the insertion/extraction reactions of
lithium ions or oxidation/reduction reaction of lithium between the negative electrode and the
positive electrode
Note 1 to entry: The cell typically has an electrolyte that consists of a lithium salt and organic solvent compound in
liquid, gel or solid form and has a metal or a laminate film casing. It is not ready for use in an application because it
is not yet fitted with its final housing, terminal arrangement and electronic control device
3.8
secondary lithium battery
battery
unit which incorporates one or more secondary lithium cells and which is ready for use
Note 1 to entry: This unit incorporates adequate housing and a terminal arrangement and may have electronic
control devices
3.9
leakage
unplanned, visible escape of liquid electrolyte from a cell or battery
[SOURCE: IEC 60050-482:2004, 482-02-32 — with deletion of "gas or other material"]
IEC CDV 62133-2 © IEC 2026
3.10
venting
release of excessive internal pressure from a cell or battery in a manner intended by design to
preclude rupture or explosion
3.11
rupture
mechanical failure of a cell container or battery case induced by an internal or external cause,
resulting in exposure or spillage but not ejection of materials
3.12
explosion
failure that occurs when a cell container or battery case opens violently and major components
are forcibly expelled
3.13
fire
emission of flames from a cell or battery for more than 1s
Note 1 to entry: Sparks and arcing are not considered as flames
3.14
portable battery
battery for use in a device or appliance which is conveniently hand-carried
3.15
portable cell
cell intended for assembly in a portable battery
3.16
lithium-ion polymer cell
cell using gel polymer electrolyte or solid polymer electrolyte, not liquid electrolyte
Note 1 to entry: Lithium-ion cells with flexible laminate casings that have liquid electrolyte are not included.
3.17
rated capacity
capacity value of a cell or 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 or battery can deliver when discharged at the reference test current of 0,2 I A to a specified end-
t
of-discharge voltage, after charging, storing and discharging under specified conditions.
[SOURCE: IEC 60050-482:2004, 482-03-15, modified — The words "cell or" in the definition
and Note 1 to entry have been added.]
3.18
reference test current
I
t
charging or discharging current expressed as I A, where I A = C Ah/1 h, as defined in IEC
t t 5
61434:1996, Clause 2, and based on the rated capacity (C Ah) of the cell or battery
3.19
upper limit charging voltage
highest charging voltage in the cell operating region, which is specified by the cell manufacturer
Note 1 to entry: this voltage is a function of temperature.
IEC CDV 62133-2 © IEC 2026
3.20
maximum charging current
maximum charging current in the cell operating region, which is specified by the cell
manufacturer
Note 1 to entry: this current is a function of temperature.
3.21
end-of-charge voltage (EOCV)
specified closed circuit voltage at which a charge of a cell or battery is terminated
3.22
coin cell
button cell
coin battery
small round cell or battery in which the overall height is less than the diameter
Note 1 to entry: In English, the term "coin cell" or "coin battery" is used for lithium batteries only while the term
"button cell" or "button battery" is only used for non-lithium batteries. In languages other than English, the terms
"coin" and "button" are often used interchangeably, regardless of the electrochemical system.
[SOURCE: IEC 60050-482:2004, 482-02-40, modified — The term "coin battery" has been
added, and the NOTE "In practice terms, the term coin is used exclusively for non-aqueous
lithium cells." has been replaced with Note 1 to entry.)]
3.23
cylindrical cell
cell with a cylindrical shape in which the overall height is equal to or greater than the diameter
Note 1 to entry: Cylindrical cells may be provided with either a rigid metal case or flexible laminate film case.
[SOURCE: IEC 60050-482:2004, 482-02-39, modified to include Note 1 to entry]
3.24
prismatic cell
cell having the shape of a parallelepiped whose faces are rectangular
Note 1 to entry: Prismatic cells may be provided with either a rigid metal case or flexible laminate film case. A
prismatic cell that has a flexible laminate material case is sometimes referred to as a pouch cell.
Note 2 to entry: P
...