IEC 63330-1:2024

IEC 63330-1 ®
Edition 1.0 2024-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Repurposing of secondary batteries –
Part 1: General requirements
Réaffectation des batteries d’accumulateurs –
Partie 1: Exigences générales
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IEC 63330-1 ®
Edition 1.0 2024-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Repurposing of secondary batteries –

Part 1: General requirements
Réaffectation des batteries d’accumulateurs –

Partie 1: Exigences générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.20, 29.220.30, 43.040.10 ISBN 978-2-8322-9003-3

– 2 – IEC 63330-1:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 General requirements . 11
4.1 Structure of repurposing . 11
4.2 Relevant data . 12
4.3 Removal of used PRODUCT and external damage check . 13
5 Diagnosis and assessment of used PRODUCT . 13
5.1 General . 13
5.2 Operating range . 14
5.3 History of critical failure of original equipment . 14
5.4 Residual performance . 15
5.5 Residual usable period for original usage . 15
5.6 Storage . 15
5.7 History of repair . 16
6 Requirements for application of repurposed PRODUCT . 16
6.1 General . 16
6.2 Operating range . 17
6.3 Safety design . 17
6.4 Performance design . 18
6.5 Usable period for repurposing . 19
Annex A (informative) Examples of data templates . 20
Annex B (normative) Repurposing of PRODUCT with change of system design . 22
B.1 General . 22
B.2 Operating range . 23
B.3 Safety design . 23
B.4 Performance design . 24
B.4.1 General . 24
B.4.2 Combination of PRODUCT. 24
B.4.3 Disassembly of battery packs or battery systems . 24
B.5 Usable period for repurposing . 24
Bibliography . 26

Figure 1 – Standards on reuse and repurposing of batteries and battery-based energy
storage systems (BESS) . 6
Figure 2 – Typical structure of PRODUCT repurposing . 11
Figure 3 – Example of actors for PRODUCT repurposing . 12
Figure 4 – Example of classification of repurposed PRODUCT. 18
Figure B.1 – Example of system design change . 22
Figure B.2 – Example of operating range change . 23
Figure B.3 – Example of usable period change . 25

Table 1 – Data on original usage for repurposing assessment. 14

Table 2 – Reference clauses for repurposed PRODUCT applications . 17
Table 3 – Example of classification of repurposed PRODUCT by performance level . 19
Table A.1 – Example of template for data on PRODUCT to be repurposed . 20
Table A.2 – Example of template for data on application of repurposed PRODUCT . 21

– 4 – IEC 63330-1:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
REPURPOSING OF SECONDARY BATTERIES –

Part 1: General requirements
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
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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 of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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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 63330-1 has been prepared by IEC technical committee 21: Secondary cells and batteries.
It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
21/1193/FDIS 21/1202/RVD
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.

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 in the IEC 63330 series, published under the general title Repurposing of
secondary 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 webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

– 6 – IEC 63330-1:2024 © IEC 2024
INTRODUCTION
Increasing concerns about global warming, air quality and energy saving have been
encouraging the utilization of rechargeable energy storage systems for different applications
such as electric mobility. In parallel, technical advances in secondary batteries, especially in
lithium-ion batteries, provide the market with the practical option to repurpose used batteries
and battery systems that can maintain substantial performance even after the end of use of the
original equipment such as electric vehicles.
In order to foster such new business and to accelerate effective and safe utilization of energy
source, it is indispensable to establish a basic International Standard for evaluation of safety
and performance of used batteries and battery systems, which derive from different equipment
with different histories, and will be repurposed for different applications.
This document intends to provide basic requirements and a procedure to evaluate the
performance and safety of used batteries and battery systems, and also provide general
requirements for application of repurposed batteries.
Figure 1 contains an overview of different standards on reuse and repurposing of batteries and
battery-based energy storage systems (BESS) developed by IEC TC 21 Secondary cells and
batteries and IEC TC 120 Electrical Energy Storage (EES) systems. The purpose of Figure 1 is
to inform users of these standards about the existence of the other standards listed in Figure 1
and give a concise overview of those standards. It also identifies areas of possible overlap and
informs users in these cases which of the standards takes precedence.

Figure 1 – Standards on reuse and repurposing of batteries
and battery-based energy storage systems (BESS)

REPURPOSING OF SECONDARY BATTERIES –

Part 1: General requirements
1 Scope
This part of IEC 63330 provides general requirements for repurposing of secondary cells,
modules, battery packs and battery systems, herein also referred to as "PRODUCT", that are
originally manufactured for other applications such as electric vehicles.
This document specifies the procedure to evaluate the performance and safety of used
PRODUCT for repurposing.
This document also provides basic requirements for application of repurposed PRODUCT.
This document targets secondary lithium ion PRODUCT and battery technologies with data
traceability.
The redox flow, Ni-MH and Pb-acid batteries are not covered by this document.
NOTE 1 General guidance on reuse and repurposing of secondary cells and batteries is provided in IEC 63338
(under development).
NOTE 2 Transportation is out of the scope of this document.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
repurposing
operation that results in PRODUCT being used for a different purpose or application than the
one that PRODUCT was originally designed for
Note 1 to entry: In this document, PRODUCT is cell, battery, module, battery pack and battery system.
Note 2 to entry: The repurposing in this document includes usage of used battery for the same type of purpose as
original equipment, with change of battery pack composition.
Note 3 to entry: Alternative common terms for repurposing include "second use" and "second life".

– 8 – IEC 63330-1:2024 © IEC 2024
3.2
secondary cell
cell
basic manufactured unit providing a source of electrical energy by direct conversion of chemical
energy, that consists of electrodes, separators, electrolyte, container and terminals, and that is
designed to be charged electrically
3.3
module
group of cells connected together either in a series and/or parallel configuration with or without
protective devices (e.g. fuse or positive temperature coefficient device) and monitoring circuitry
[SOURCE: IEC 62619:2022, 3.9]
3.4
battery pack
energy storage device, which comprises one or more cells or modules electrically connected
and has monitoring circuitry which provides information (e.g. cell voltage) to a battery system
to influence the battery’s safety, performance and/or service life
Note 1 to entry: The battery pack may incorporate a protective housing and be provided with terminals or other
interconnection arrangements.
[SOURCE: IEC 62619: 2022, 3.10]
3.5
battery system
system which comprises one or more cells, modules or battery packs and has a battery
management system capable of controlling current in case of overcharge, overcurrent,
overdischarge, and overheating
Note 1 to entry: The battery system may have cooling or heating units. More than one battery system may constitute
a larger battery system. The battery system is sometimes also referred to as a battery.
[SOURCE: IEC 62619:2022, 3.11, modified – The second preferred term and original Note 1 to
entry have been deleted.]
3.6
battery management system
BMS
electronic system associated with a battery which has functions to control current in case of
overcharge, overcurrent, overdischarge, and overheating and which monitors and/or manages
the battery's state, calculates secondary data, reports that data and/or controls its environment
to influence the battery's safety, performance and/or service life
Note 1 to entry: Overdischarge cut off is not mandatory if there is an agreement between the cell manufacturer and
the customer.
Note 2 to entry: The function of the BMS can be assigned to the battery pack or to equipment that uses the battery.
Note 3 to entry: The BMS can be divided and it can be found partially in the battery pack and partially on the
equipment that uses the battery.
Note 4 to entry: The BMS is sometimes also referred to as a BMU (battery management unit).
[SOURCE: IEC 62619:2022, 3.12, modified – Note 1 to entry has been modified.]

3.7
rated capacity
C
n
capacity value of a cell or battery determined under specified conditions and declared by the
cell manufacturer
Note 1 to entry: C is expressed in ampere hour (A h).
n
[SOURCE: IEC 60050-482:2004, 482-03-15, modified – The definition has been changed
because both a cell and a battery can be tested for rated capacity. Note 1 to entry has been
added.]
3.8
state of charge
SOC
quantity of electricity stored in a cell expressed as a percentage of rated capacity
3.9
state of certified energy
SOCE
measured or on-board usable battery energy (UBE) performance at a specific point in its
lifetime, expressed as a percentage of the certified usable battery energy
Note 1 to entry: SOCE is available only for off vehicle charging hybrid electric vehicle and pure electric vehicle.
[SOURCE: UN-GTR22, 3.9]
3.10
usable battery energy
UBE
the energy supplied by the battery from the beginning of the test procedure used for certification
until the applicable break-off criterion of the test procedure used for certification is reached
[SOURCE: UN-GTR22, 3.3]
3.11
operating region
set of conditions during charging and discharging in which the cell operates within the range of
voltage, current and temperature as specified by the cell manufacturer to ensure the safe use
of the cell
Note 1 to entry: The limits of the operating region are specified for the minimum safety; they are different from the
charging voltage and temperature to optimize the performance of the cell such as cycle life.
3.12
operating range
set of conditions during charging and discharging in which the battery system operates within
the range of voltage, current and temperature as specified by the system manufacturer to
ensure the safe use of the battery system
Note 1 to entry: Figure B.2 shows the relation between the operating range and the operating region.
3.13
safety design
battery design to avoid or control systematic failures and to detect or control random hardware
failures, or mitigate their harmful effects

– 10 – IEC 63330-1:2024 © IEC 2024
3.14
systematic failure
failure related in a deterministic way to a certain cause, that can only be eliminated by a change
of the design or of the manufacturing process, operational procedures, documentation or other
relevant factors
3.15
random hardware failure
failure that can occur unpredictably during the lifetime of a battery and that follows a probability
distribution
3.16
critical failure
termination of an intended behaviour of a battery due to a fault manifestation
3.17
fault
abnormal condition that can cause a battery to fail
3.18
service life
total period of useful life of PRODUCT in operation which is specified for original usage
Note 1 to entry: For secondary cells and batteries, the service life may be expressed in time, number of
charging/discharging cycles, capacity in ampere hours (Ah) and operating conditions (temperature range, depth of
discharge, etc.).
Note 2 to entry: The service life does not equal the guarantee or warrantee period provided by the original
manufacturer.
Note 3 to entry: The service life is not clearly specified for vehicle propulsion application.
[SOURCE: IEC 60050-482:2004, 482-03-46, modified – The entry has been changed because
batteries can still be utilized after reaching the end of their service life for the original purpose
when repurposed.]
3.19
residual usable period
remaining period of service life or estimated remaining period of useful life of battery in
operation
3.20
usable period for repurposing
period usable in the application with repurposed PRODUCT specified by the designer of a
system with repurposed PRODUCT
3.21
basic system design
design of repurposed PRODUCT in order to use repurposed PRODUCT safely in a system or
subsystem for energy storage
4 General requirements
4.1 Structure of repurposing
Typical structure for repurposing of PRODUCT is shown in Figure 2. In this document,
requirements for the following phases are specified:
– removal of PRODUCT from original equipment;
– inspection and assessment of used PRODUCT;
– storage of PRODUCT to be repurposed;
– basic system design using repurposed PRODUCT.

Figure 2 – Typical structure of PRODUCT repurposing
Figure 3 shows examples of actors for PRODUCT repurposing.

– 12 – IEC 63330-1:2024 © IEC 2024

Key
a to k actors for each business area
Figure 3 – Example of actors for PRODUCT repurposing
This document may be applied for the PRODUCT that is repurposed after the second use. If
the PRODUCT is repurposed multiple times, all the data on original usage (Table 1) and any
subsequent usage shall be assessed.
NOTE For specific requirements for electrical energy storage (EES) systems using reused battery, see
IEC 62933-4-4 and IEC 62933-5-3.
4.2 Relevant data
Data required for repurposing of PRODUCT are as follows.
1) Basic information:
– manufacturer of original equipment;
– chemistry;
– manufacture year and month;
– serial number, if available;
– battery pack dismantling safety procedure.
2) Data on original usage:
– operating range;
– history of critical failure;
– residual performance;
– residual usable period for original usage at the end of it;
– SOCE for traction batteries for off vehicle charging hybrid electric vehicle and pure
electric vehicle;
– storage;
– history of repair and date, if existing.

If the PRODUCT is repurposed multiple times, data listed above for any usage subsequent
to the original usage are also required.
If the PRODUCT is repaired in accordance with the specification by the manufacturer,
relevant data should be provided.
3) Data for designing system with repurposing PRODUCT:
– operating range;
– usable period for repurposing;
– performance design;
– safety design.
NOTE Usable period for repurposing is determined by the actor conducting basic system design in Figure 3.
Annex A provides examples of data templates to be used for collection and management of
data from 1) to 3).
4.3 Removal of used PRODUCT and external damage check
Used PRODUCT shall be removed from the original equipment as instructed in a dismantle or
disassembly manual issued by the original equipment manufacturer. If such instructions are not
available, special caution for high voltage hazards applies. The removal of battery systems can
result in harm if adequate precautions are not taken. The removal should only be performed by
qualified and experienced persons using adequate protection.
For PRODUCT from an electric vehicle application, it is recommended to obtain the data on
usage and critical failure before removal from the vehicle using, for example, a vehicle
diagnostic device.
After removal from original equipment, the PRODUCT shall be checked externally as follows:
– Make sure there is no leakage of electrolyte by visual confirmation or by using an odour
sensor. If fluid leakage is detected in a liquid-cooled battery pack, the PRODUCT shall be
identified as damaged except in cases of coolant leakage or water ingress.
Used PRODUCT with external damage – for example, severe deformation, crack or blemish in
the outer case of the PRODUCT – shall not be repurposed, and should be recycled or disposed
of. Relevant laws and regulations can exist.
Used PRODUCT without external damage shall be assessed for feasibility of repurposing in
accordance with Clause 5.
If available and not damaged, the module and BMS of battery packs and battery systems may
be reused even if the battery pack or battery system has a damaged outer case. Degree of
damage and, if possible, cause of damage of outer case shall be recorded.
5 Diagnosis and assessment of used PRODUCT
5.1 General
The diagnosis and assessment of used PRODUCT for feasibility of repurposing and applicability
to specific equipment shall be made based on the data on original usage in Table 1. The data
in Table 1 are indispensable to ensure the safety and performance of used PRODUCT for
repurposing. If the data in Table 1 are not available, the PRODUCT shall not be repurposed.
The other data, for example, insulation resistance, EMC (electromagnetic compatibility),
operating region of cell, may be assessed in accordance with the agreement of the data provider,
if indispensable for a specific application of repurposing.

– 14 – IEC 63330-1:2024 © IEC 2024
NOTE The data provider is the original equipment manufacturer, the cell or battery manufacturer, or the
administrator of relevant data.
Table 1 – Data on original usage for repurposing assessment
Subclause of this
Data on original usage
document
5.2 Data on operating range
5.3 Data on history of critical failure of original equipment
5.4 Data on residual performance
5.5 Data on residual usable period for original usage
5.6 Data on storage
5.7 Data on history of repair
If the PRODUCT is repurposed multiple times, the data in Table 1 are also required for any
usage subsequent to the original usage.
5.2 Operating range
The operating range of PRODUCT for original usage shall be confirmed.
The data on operating range shall include the following:
– upper limit operating temperature;
– lower limit operating temperature;
– upper limit charging voltage;
– lower limit discharging voltage;
– maximum charging current;
– maximum discharging current.
The operating region of the cell shall be confirmed, if necessary.
5.3 History of critical failure of original equipment
Used PRODUCT with one or more of the following critical failure data shall not be repurposed:
– overcharge;
– overdischarge;
– overcurrent;
– overtemperature;
– insulation failure;
– accident.
The other data may be assessed in accordance with the agreement of the data provider, if
indispensable for specific application of repurposing.
History of critical failure and other data of PRODUCT may be stored in the battery management
system, other storage devices in the equipment or external storage devices.
When the critical failure is limited to an insulation failure, the PRODUCT may be repurposed
provided that there is no evidence of water exposure, and the insulation resistance is higher
than the specified value.
When the critical failure data are limited to an accident, the PRODUCT may be repurposed
provided that there is no evidence of any battery damage.
NOTE The accident history can be confirmed, for example, for electric vehicles, by incident data in the electronic
control unit, such as history of high voltage cutoff.
5.4 Residual performance
The actual capacity of used PRODUCT shall be estimated or measured in accordance with, for
example, standards applicable to the original equipment. The estimation or measuring method
shall be recorded. The measuring conditions include charging condition (upper and lower limit
voltage, charging current and charging time), discharging current, cut-off voltage, and
temperature.
The actual capacity of PRODUCT of electric vehicle application can be obtained through an
on-board PRODUCT performance indicating function, before removal from the vehicle.
SOCE can be used as a residual performance parameter instead of the actual capacity.
NOTE Additional parameters can be measured or obtained in order to specify the residual performance including
resistance, power, energy efficiency, self-discharge rate, spread in cell voltage, etc. in accordance with standards or
other documents applicable to the original equipment.
5.5 Residual usable period for original usage
The residual usable period for original usage after the original usage of used PRODUCT shall
be assessed
– based on the estimated usable period specified by the original equipment manufacturer after
deduction of age of service of the original equipment, or
– based on the age of service and history of original usage.
If the PRODUCT is repurposed multiple times, the residual usable period after any usage
subsequent to the original usage shall also be assessed.
NOTE The history of original usage includes, for example, data on remaining life of contactors and residual capacity.
If the used PRODUCT has been stored after the original usage and before application to new
equipment, the period of such storage shall also be deducted from the usable period.
5.6 Storage
The PRODUCT for repurposing shall be stored under controlled conditions until the application
to equipment.
The PRODUCT in storage shall:
– be kept dry;
– be kept away from heat and fire;
– be kept away from direct sunlight;
– be kept away from high temperature;
– not be dropped and stepped on.
The PRODUCT shall not be repurposed if the storage data are not available. The following
storage data shall be recorded:
– SOC or voltage of PRODUCT at the beginning of storage;
– ambient temperature of storage;
– period and beginning date of storage.

– 16 – IEC 63330-1:2024 © IEC 2024
If the SOC or voltage after the storage is below the lower limit of operating range of equipment
that is going to use repurposed PRODUCT, the PRODUCT shall not be repurposed.
5.7 History of repair
The data on history of repair shall contain all the relevant information of components within
PRODUCT which had been changed or modified with the date of these modifications.
6 Requirements for application of repurposed PRODUCT
6.1 General
The applicability of repurposed PRODUCT to an equipment shall be determined based on the
data in Clause 5, and the specifications required by the equipment to which the repurposed
PRODUCT is to be applied.
NOTE 1 Additional requirements can be applied by standards and/or regulations relevant to a new application going
to use repurposed PRODUCT as required.
The following shall be evaluated for each application and for each PRODUCT:
– operating range;
– safety;
– performance;
– usable period for repurposing.
Table 2 shows the guidance of reference clauses depending on system designs with used
PRODUCT.
If the repurposed PRODUCT is used without change in system design under the environmental
and usage conditions with the load not exceeding that of the original equipment, the safety
design, performance design and residual usage period of the original usage may be applied.
If the system design is changed from the original usage, the safety design, performance design
and usable period shall be proved and assessed for repurposing.
NOTE 2 The environmental and usage conditions include:
– installation environment;
– ambient temperature;
– humidity;
– dust;
– vibration;
– acceleration;
– high power (kW) and high frequency charge and/or discharge;
– cell fixing condition inside module, etc.

Table 2 – Reference clauses for repurposed PRODUCT applications
System design Safety design Performance Usable period
design
Hardware design Software design
Safety design of Performance Usable period of
original usage design of original original usage
applicable (6.3) usage applicable applicable (6.5)
(6.4)
Safety design for Performance Usable period for

repurposing to be design for repurposing to be
proved (B.3) repurposing to be proved (B.5)
proved (B.4)
NOTE 2 An example of cases where system design change is not required is when the PRODUCT was originally
designed with consideration for some specific usages of repurposed PRODUCT. Examples of the systems with design
change from the original equipment are shown in Clause B.1.
6.2 Operating range
A system applying the repurposed PRODUCT should be designed to be used within the
operating range of the PRODUCT for original usage (see 5.2).
The operating range of repurposing PRODUCT shall include the following:
– upper limit operating temperature;
– lower limit operating temperature;
– upper limit charging voltage;
– lower limit discharging voltage;
– maximum charging current;
– maximum discharging current.
For the operating range of used PRODUCT whose system design is changed, Clause B.2 of
Annex B applies.
6.3 Safety design
Safety of repurposed PRODUCT shall be assessed and secured based on the data on original
usage as specified in Clause 5 and safety design of the system applying the repurposing
PRODUCT.
If the age of service of the PRODUCT at the end of original usage goes beyond the service life
or if the service life is not specified, the safety of repurposed PRODUCT shall be determined in
accordance with the assessment of age of service and history of original usage.
If the PRODUCT is repurposed multiple times, the age of service and history of any usage
subsequent to the original usage shall also be assessed.
WARNING – Aging of the PRODUCT can incur unstable electrode condition and leakage of
electrolyte due to decrease of airtightness, and can cause hazardous events.
NOTE The PRODUCT is designed as a system including BMS to secure the safety of original equipment. If the
PRODUCT is repurposed without change from the originally designed system, and within the operating range and
under the environmental and usage conditions with the load not exceeding that of the original equipment, the safety
design of the battery system is maintained.
For used PRODUCT whose system design is changed from original usage, and when the safety
design of original equipment is not applicable, Clause B.3 applies.

– 18 – IEC 63330-1:2024 © IEC 2024
6.4 Performance design
The PRODUCT is designed to ensure the required performance of original equipment. If the
PRODUCT is repurposed without change from the originally designed system, within the
operating range of original equipment, and to be used under the environmental and usage
conditions with the load not exceeding that of the original equipment, the performance design
of the battery system is maintained.
NOTE The usage environment includes installation environment, ambient temperature, humidity and
charging/discharging cycles.
The performance includes, for example, the following:
a) capacity;
b) resistance;
c) power;
d) energy efficiency;
e) self-discharge;
f) others.
The repurposed PRODUCT shall have performance required by the equipment to be applied.
The residual performance of used PRODUCT is as specified in 5.4.
The performance of repurposed PRODUCT can be remeasured in accordance with the relevant
standard for the equipment to be applied.
Required performance of repurposed PRODUCT depends on the applications. For the same
application, the PRODUCT with the same level of residual performance and usable period
should be used. The PRODUCT with different level of performance can be used for the same
application if the safety of the system is confirmed in accordance with 6.3.
Figure 4 shows an example of classification based on the residual performance level and usable
period, which can be used to evaluate the homogeneity of repurposed PRODUCT. The
PRODUCT classified as A1 group, for example, has relatively long usable period and high
performance, and can be used for a system which requires a PRODUCT with relatively high
specifications.
Key
A1 to A3, B1 to B3, C1 to C3 example classification of repurposed PRODUCT in terms of performance and usable
period
Figure 4 – Example of classification of repurposed PRODUCT

The residual performance level of the repurposed PRODUCT in Figure 4 can be classified by
some performance criteria such as capacity, resistance, etc. Table 3 shows an example of a
sorting method using the performance level. In this method, the worst criterion level determines
the performance bin, for example, a PRODUCT with capacity level a and resistance level b
c r
goes into performance bin B.
Table 3 – Example of classification of repurposed PRODUCT by performance level
Performance level
Residual capacity ratio Internal resistance ratio Performance
bin
(Ah/Ah %) (Ω/Ω %)
range of value level range of value level
a a
100 to x 100 to x′ A
c r
b b
x to y x′ to y′ B
c r
c c
y to z y′ to z′ C
c r
d d
< z < z′ Recycling
c r
Key
a , b , c , d level ratings of residual capacity ratio
c c c c
a , b , c , d level ratings of internal resistance ratio
r r r r
x′ is not equal to x. This is also the case with y′ and z′.

For used PRODUCT whose system design is changed from the original usage, and when the
performance design of original equipment is not applicable, Clause B.4 applies.
6.5 Usable period for repurposing
A system applying repurposed PRODUCT shall be d
...