SIST EN 60896-11:2003

Stationary lead-acid batteries -- Part 11: Vented types - General requirements and methods of tests

This part of EN 60896 is applicable to lead-acid cells and batteries which are designed for service in fixed locations (i.e. not habitually to be moved from place to place) and which are permanently connected to the load and to the d.c. power supply. Batteries operating in such applications are called stationary batteries. Any type or construction of lead-acid battery may be used for stationary battery applications. This part 11 of the standard is applicable to vented types only. This first edition of EN 60896-11 cancels and replaces EN 60896-1 (first edition) published in 1987 and its amendments 1 (1988) and 2 (1990), and constitutes a technical revision.

Ortsfeste Blei-Akkumulatoren -- Teil 11: Geschlossene Batterien - Allgemeine Anforderungen und Prüfverfahren

Batteries stationnaires au plomb -- Partie 11: Batteries au plomb du type ouvert - Prescriptions générales et méthodes d'essai

La présente partie de la EN 60896 est applicable aux éléments et batteries au plomb destinés à être exploités dans des installations à poste fixe (c'est-à-dire qui ne sont pas en règle générale prévus pour être déplacés) et connectés en permanence à une charge et à une source de courant continu. Les batteries opérant dans ces conditions sont dénommées "batteries stationnaires". Tous les types et toutes les constructions d'éléments ou de batteries au plomb peuvent être utilisés pour des applications de batteries stationnaires. La présente Partie 11 de la EN 60896 n'est applicable qu'aux éléments et batteries au plomb du type ouvert. Cette première édition de la EN 60896-11 annule et remplace la EN 60896-1 (première édition) parue en 1987 et ses amendements 1 (1988) et 2 (1990), dont elle constitue une révision technique.

Stationary lead-acid batteries - Part 11: Vented types - General requirements and methods of tests

General Information

• Status: Published
• Publication Date: 31-Mar-2003
• ICS: 29.220.20 - Acid secondary cells and batteries
• Technical Committee: ISCB - Secondary cells and batteries
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2003
• Due Date: 01-Apr-2003
• Completion Date: 01-Apr-2003
• Ref Project: EN 60896-11:2003 - Stationary lead-acid batteries - Part 11: Vented types - General requirements and methods of tests

Relations

• Replaces: SIST EN 60896-1:1997 - Stationary lead-acid batteries - General requirements and methods of test -- Part 1: Vented types
• Effective Date: 29-Jan-2023
• Replaces: SIST EN 60896-1:1997/A2:1997 - Stationary lead-acid batteries - General requirements and methods of test -- Part 1: Vented types
• Effective Date: 29-Jan-2023
• Replaces: SIST EN 60896-1:1997 - Stationary lead-acid batteries - General requirements and methods of test -- Part 1: Vented types
• Effective Date: 06-May-2014
• Replaces: SIST EN 60896-1:1997/A2:1997 - Stationary lead-acid batteries - General requirements and methods of test -- Part 1: Vented types
• Effective Date: 06-May-2014
• Replaces: SIST EN 60896-1:1997 - Stationary lead-acid batteries - General requirements and methods of test -- Part 1: Vented types
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI SIST EN 60896-11:2003

STANDARD
april 2003
Stationary lead-acid batteries - Part 11: Vented types - General requirements and
methods of tests
ICS 29.220.20 Referenčna številka
SIST EN 60896-11:2003(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

---------------------- Page: 1 ----------------------

EUROPEAN STANDARD EN 60896-11
NORME EUROPÉENNE
EUROPÄISCHE NORM January 2003

ICS 29.220.20 Supersedes EN 60896-1:1991 + A2:1992


English version


Stationary lead-acid batteries
Part 11: Vented types -
General requirements and methods of tests
(IEC 60896-11:2002)


Batteries stationnaires au plomb Ortsfeste Blei-Akkumulatoren
Partie 11: Batteries au plomb Teil 11: Geschlossene Batterien -
du type ouvert - Allgemeine Anforderungen und
Prescriptions générales Prüfverfahren
et méthodes d'essai (IEC 60896-11:2002)
(CEI 60896-11:2002)






This European Standard was approved by CENELEC on 2002-12-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60896-11:2003 E

---------------------- Page: 2 ----------------------

EN 60896-11:2003 - 2 -
Foreword

The text of document 21/572/FDIS, future edition 1 of IEC 60896-11, prepared by IEC TC 21,
Secondary cells and batteries, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 60896-11 on 2002-12-01.

This European Standard supersedes EN 60896-1:1991 + A2:1992.

The following dates were fixed:

– latest date by which the EN has to be implemented
 at national level by publication of an identical
 national standard or by endorsement (dop) 2003-09-01

– latest date by which the national standards conflicting
 with the EN have to be withdrawn (dow) 2005-12-01

Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex ZA is normative and annex A is informative.
Annex ZA has been added by CENELEC.
__________

Endorsement notice

The text of the International Standard IEC 60896-11:2002 was approved by CENELEC as a European
Standard without any modification.
__________

---------------------- Page: 3 ----------------------

- 3 - EN 60896-11:2003
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
1)
IEC 60050-151 - International Electrotechnical - -
Vocabulary (IEV)
Part 151: Electrical and magnetic
devices

IEC 60051 Series Direct acting indicating analogue EN 60051 Series
electrical measuring instruments and
their accessories

1) 2)
IEC 60359 - Electrical and electronic measurement EN 60359 2002
equipment - Expression of performance

IEC 60417 Series Graphical symbols for use on equipment EN 60417 Series

1)
IEC 60485 - Digital electronic d.c. voltmeters and - -
d.c. electronic analogue-to-digital
converters





1)
Undated reference.
2)
Valid edtion at date of issue.

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NORME
CEI
INTERNATIONALE IEC
60896-11
INTERNATIONAL
Première édition
STANDARD
First edition
2002-12
Batteries stationnaires au plomb –
Partie 11:
Batteries au plomb du type ouvert –
Prescriptions générales et méthodes d'essai
Stationary lead-acid batteries –
Part 11:
Vented types –
General requirements and methods of tests
© IEC 2002 Droits de reproduction réservés ⎯ Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail]  Web: www.iec.ch
CODE PRIX
R
Commission Electrotechnique Internationale PRICE CODE
International Electrotechnical Commission
ɆɟɠɞɭɧɚɪɨɞɧɚɹɗɥɟɤɬɪɨɬɟɯɧɢɱɟɫɤɚɹɄɨɦɢɫɫɢɹ
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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60896-11 © IEC:2002 – 3 –
CONTENTS
FOREWORD . 5
1 Scope and object . 9
2 Normative references. 9
3 Definitions .11
4 Mechanical strength.11
5 Electrolyte levels .11
6 Electrolyte reserve.11
7 Capacity .13
8 Suitability for floating battery operation.13
9 Endurance .15
10 Charge retention.15
11 Short-circuit current and internal resistance.17
12 Accuracy of measuring instruments .17
13 Preparation of cells and batteries for testing .19
14 Capacity test.19
15 Test of suitability for floating battery operation.23
16 Endurance in discharge-charge cycles.25
17 Endurance in overcharge .25
18 Charge retention test .27
19 Short-circuit current and internal resistance determination.27
20 Test sequence .31
21 Cell and battery markings .31
22 Information to be included on the cell or monobloc package .33
23 Recommended information for the battery room.33
24 Marking of polarity .33
Annex A (informative) Recommended tests .35
Figure 1 – Discharge characteristic U = f(I) .29
Figure 2 – Typical test circuit .31
Table 1 – Test sequence recommended for type tests.31
Table A.1 – Recommended use of tests for stationary battery applications.37
Table A.2 – Recommended use of tests appropriate to types of stationary cells
and batteries .39

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60896-11 © IEC:2002 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
STATIONARY LEAD-ACID BATTERIES –
Part 11: Vented types –
General requirements and methods of tests
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60896-11 has been prepared by IEC technical committee 21:
Secondary cells and batteries.
This first edition of IEC 60896-11 cancels and replaces IEC 60896-1 (first edition) published
in 1987 and its amendments 1 (1988) and 2 (1990), and constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
21/572/FDIS 21/579/RVD
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 3.
Annex A is for information only.

---------------------- Page: 7 ----------------------

60896-11 © IEC:2002 – 7 –
This standard constitutes part 11 of the IEC 60896 series, published under the general title
Stationary lead acid batteries. At the time of the publication of this part, the following parts
had already been published or were in the process of being published:
• Part 11: Vented types – General requirements and methods of tests (this part)
1
• Part 21: Valve regulated types – Functional characteristics and methods of test .
The committee has decided that this publication remains valid until 2008. At this date, in
accordance with the committee’s decision, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
———————
1
 To be published. This standard will replace IEC 60896-2:1995, Stationary lead-acid batteries – General
requirements and methods of test – Part 2: Valve regulated types.

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60896-11 © IEC:2002 – 9 –
STATIONARY LEAD-ACID BATTERIES –
Part 11: Vented types –
General requirements and methods of tests
1 Scope and object
This part of IEC 60896 is applicable to lead-acid cells and batteries which are designed for
service in fixed locations (i.e. not habitually to be moved from place to place) and which are
permanently connected to the load and to the d.c. power supply. Batteries operating in such
applications are called “stationary batteries”.
Any type or construction of lead-acid battery may be used for stationary battery applications.
This part 11 of the standard is applicable to vented types only.
The object of this standard is to specify general requirements and the main characteristics,
together with corresponding test methods associated with all types and construction modes of
lead-acid stationary batteries, excluding valve-regulated types.
Recommendations on the use of tests for stationary battery application are given in Table A.1.
Recommendations relating the type of cell or monobloc to the use of tests are given in
Table A.2.
Statements and claims of basic performance data by the manufacturer shall correspond
to those tests.
The tests may also be used for type qualification.
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 60050(151), International Electrotechnical Vocabulary (IEV) – Part 151: Electrical and
magnetic devices
IEC 60051 (all parts), Direct acting indicating analogue electrical measuring instruments
and their accessories
IEC 60359, Electrical and electronic measurement equipment – Expression of performance
IEC 60417 (all parts), Graphical symbols for use on equipment
IEC 60485, Digital electronic d.c. voltmeters and d.c. electronic analogue-to-digital converters

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60896-11 © IEC:2002 – 11 –
3 Definitions
For the purposes of the present part of IEC 60896, the following definitions apply.
3.1
electrolyte reserve
volume of electrolyte between minimum and maximum level indication
3.2
rated capacity
C
rt
quantity of electricity, declared by the manufacturer, which a cell or battery can deliver under
specified conditions after a full charge. This value is usually expressed in ampere-hours (see
IEV 486-03-22)
3.3
nominal capacity
C
nom
suitable approximate quantity of electricity used to identify the capacity of a cell or battery.
This value is usually expressed in ampere-hours (see IEV 486-03-21)
3.4
endurance
ability of a cell or battery to function and withstand operations under specified conditions for
a minimum period of time or repeated application thereof
4 Mechanical strength
Stationary cells or batteries shall be designed to withstand mechanical stresses during normal
transportation and handling.
Resistance to earthquakes, if required, shall be particularly specified.
5 Electrolyte levels
5.1 Each cell shall be equipped with a device to indicate the minimum and maximum
electrolyte levels.
5.2 For containers made of translucent material, the minimum and maximum levels shall be
indicated on the container wall.
5.3 For containers made of an opaque material, a gauge shall be provided indicating the
position of the electrolyte level in relation to the minimum and maximum levels.
6 Electrolyte reserve
6.1 The electrolyte reserve (see 3.1), together with the battery design and the charging
method used, governs the frequency of inspections for electrolyte level readjustments.
6.2 For batteries in float operation (see 8.1) the minimum electrolyte reserve is specified in
Item d) of 8.2.

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60896-11 © IEC:2002 – 13 –
7 Capacity
(Test, see Clause 14).
7.1 The essential characteristic of a stationary cell or battery is its capacity for the storage of
electric energy. This capacity, expressed in ampere-hours (Ah) varies with the conditions
of use (discharge current and voltage, and temperature).
The recommended t-values are:
t = 240 h, 20 h, 10 h, 8 h, 5 h, 3 h, 2 h, 1 h, 0,5 h.
From these various C values one value may be selected and declared as rated capacity C
rt rt
(see 3.2).
7.2 The most commonly used values of t are between 10 h and 3 h. For these, the final
voltage (end-of-discharge voltage) shall be U = 1,80 V per cell (unless otherwise
f
recommended or requested by the manufacturer or user). For other discharge rates,
the recommended value of U shall be set by national standards or shall be stated by the
f
manufacturer together with the value of C or together with the particular performance data
rt
(see 7.5).
7.3 The discharge current corresponding to the rated capacity C at the chosen reference
rt
temperature 20 °C or 25 °C is:
I = C / t (A)
rt rt
to the final discharge voltage U in accordance with 7.2.
f
7.4 The actual capacity C shall be determined by discharging a fully charged cell or battery
a
in accordance with Clause 14. The resultant value shall be used for comparison with the rated
capacity C stated by the manufacturer, or for control of the state of a battery after long
rt
periods of service.
7.5 The determination of the actual capacity C in accordance with Clause 14 may also be
a
used for comparison with particular performance data indicated by the supplier. In this case
the current I in 14.4 shall be substituted by the particular current corresponding to the
rt
relevant performance data.
8 Suitability for floating battery operation
(Test, see Clause 15).
8.1 Stationary batteries are mainly used in floating operation
A battery in floating operation has a constant voltage U , permanently applied to its terminal
flo
which is sufficient to maintain it in a state close to full charge and is intended to supply a
circuit whose normal power supply may fail. Suitability for this operation shall be checked by
a test carried out on cells or on batteries.
Batteries which are not in true floating operation (for example, solar power storage) should
not be qualified according to the test method described in Clause 15.

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60896-11 © IEC:2002 – 15 –
8.2 Batteries operating in continuous floating operation
Batteries operating in continuous floating operation according to Clause 15 shall meet the
following requirements:
a) the electrolyte densities shall remain within specified limits in all cells;
b) the individual cell voltages shall remain within specified limits;
NOTE In some batteries with monobloc design the voltage of individual cells cannot be measured. In those
cases the assessment of uniformity should be made with the voltage of individual monobloc units.
c) after a period of six months the actual capacity C on discharge according to Clause 14
a
shall be at least equal to C ;
rt
d) after a period of six months the loss of electrolyte shall not exceed 50 % of the volume
between the minimum and maximum levels. The volume between the minimum and
maximum levels shall be available from the manufacturer.
9 Endurance
See definition 3.4.
Depending on the battery and system application an endurance test based on discharge-
charge cycles or an overcharge shall be carried out.
9.1 Endurance in cycles
The endurance in discharge-charge cycles shall be tested according to Clause 16 where
frequent discharges of the battery are to be encountered due either to a deliberate choice of
operational application or to frequent power-line outages.
The minimum requirement of the test shall be two sets of 50 cycles each (N = 100 cycles)
.
before capacity drops below 0,95 C where C is the rated capacity at the 10 h-rate
10 10
.
Optionally, the manufacturer may state the number of cycles as C = 0,8 C .
a 10
9.2 Endurance in overcharge
The endurance in overcharge shall be tested according to Clause 17 where natural
overcharge related potential failure modes such as corrosion of grids, plate group bars or
terminals of the battery are to be encountered due either to high ambient temperatures, poor
float voltage regulation or similar.
The minimum requirement of the test shall be six periods of 720 h each before the capacity
drops below 0,8 C where C is the rated capacity at the 1 h rate to U as defined in Clause 7.
f
10 Charge retention
Although, in the majority of cases, stationary batteries are on permanent charge, it is useful to
establish their capability to retain charge by means of a test for cases where the battery may
become electrically disconnected either normally or accidentally.

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60896-11 © IEC:2002 – 17 –
The charge retention shall be determined according to Clause 18 and expressed as C = per
R
cent of the initial capacity C .
a
The minimum value C shall be in accordance with the applicable product standard or as
R
indicated by the manufacturer.
11 Short-circuit current and internal resistance
These characteristics are useful for safety and equipment-protection calculations required in
some installations.
The values of the short-circuit current I (A) and the internal resistance R (Ω), if required,
sc i
shall be indicated by the manufacturer. These values shall be determined according to
Clause 19.
12 Accuracy of measuring instruments
12.1 Electrical measuring instruments
12.1.1 Ranges of measuring devices
The instruments used shall enable the values of voltage and current to be measured. The
calibre of these instruments and the measuring methods shall be chosen so as to ensure the
accuracy specified for each test.
For analogue instruments this implies that readings shall be taken in the last third of the
graduated scale.
Any other measuring instruments may be used provided they give an equivalent accuracy.
12.1.2 Voltage measurement
The instruments used for voltage measurement shall be voltmeters of an accuracy class equal
to 0,5 or better. The resistance of the voltmeters used shall be at least 1 kΩ/V (see IEC 60051
or IEC 60485).
12.1.3 Current measurement
The instruments used for current measurement shall be ammeters of an accuracy class equal
to 0,5 or better. The entire assembly of ammeter, shunt and leads shall be of an accuracy
class of 0,5 or better (see IEC 60051 or refer to IEC 60359).
12.2 Temperature measurement
For measuring temperature, thermometers shall be used having a suitable measuring range in
which the value of each graduated division is not in excess of 1 °C. The absolute accuracy of
the instruments shall be at least 1 °C.
12.3 Electrolyte density measurement
For measuring electrolyte densities, hydrometers or other instruments shall be used with
3
scales so graduated that the value of each division is not in excess of 5 kg/m . The absolute
3
accuracy of the instruments shall be at least 5 kg/m .

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60896-11 © IEC:2002 – 19 –
12.4 Time measurement
For measurement of time, the instruments’ accuracy shall be ±1% or better.
13 Preparation of cells and batteries for testing
13.1 Cells and batteries shall be put into service in accordance with the manufacturer's
instructions (for example, in the activation of dry charged batteries).
13.2 All tests shall be carried out on new and fully charged cells or batteries.
13.3 The cells or batteries are considered as fully charged when either
a) during charging at constant current, the observed voltage and electrolyte density do not
show any change beyond the tolerance of the measuring instruments, during a period of
2 h, taking into account changes in the temperature of the electrolyte, or
b) during charging at constant voltage, the observed current and electrolyte density do not
show any change beyond the tolerance of the measuring instruments, during a period of
2 h, taking into account changes in the temperature of the electrolyte unless otherwise
specified by the manufacturer.
13.4 In each cell the electrolyte shall be adjusted to the maximum level, as in 4.1. The
electrolyte density shall then be in the range of tolerances quoted by the manufacturer for
the nominal electrolyte density.
13.5 The purity of the topping-up water and of the electrolyte shall be as specified by the
manufacturer.
14 Capacity test
14.1 The cells or the battery shall be prepared in accordance with Clause 13.
14.2 In order to facilitate temperature readings on a battery, one pilot cell is selected per
group of six cells for batteries of 100 cells or less, and per group of 10 cells for batteries of
more than 100 cells; the total of the selected cells being considered as representative of the
average temperature of the battery.
14.3 The electrolyte temperature of each pilot cell shall be read immediately prior to
discharge. The individual readings shall be between 15 °C and 30 °C.
The average initial temperature v is calculated as the arithmetic mean of the individual values.
The ambient temperature shall be maintained between 15 °C and 30 °C.
NOTE It is desirable that the average initial electrolyte temperature v and the ambient temperature is as near to
the chosen reference temperature of 20 °C or 25 °C as practically possible.
14.4 Within 1 h to 24 h after the end of charging, the cells or the battery shall be subjected
to a discharge current I (see 7.3).
rt
This current shall be maintained constant within ±1 % throughout the whole discharge time.
During discharging manual adjustments may be necessary. In these circumstances deviations
of the discharge current shall be tolerated, provided they are within ±5 % of the specified
value.

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60896-11 © IEC:2002 – 21 –
14.5 The voltage between the terminal of the cells or the battery shall either be recorded
automatically against time or taken by readings from a voltmeter (see 12.1.2). In the latter
case, readings shall be made at least at 25 %, 50 % and 80 % of the calculated discharge
time:
C
rt
t = (h)
I
rt
and then at suitable time intervals, which permits the detection of the transition to the final
discharge voltage U .
f
14.6 The discharge shall be discontinued when the voltage has reached the value
n × U (V)
f
where n is the number of cells (see 7.2).
The discharge time shall be noted.
The test shall be terminated when the average voltage is reached or a cell or monobloc
has reached a voltage of U = U – 200 m V or, in the case of monoblocs with n cells,
f pc
U = U – × 200 mV.
n
f
NOTE 1 In the case of a type-qualification test on single cells, the discharge voltage is measured across the
terminals including one intercell connector arrangement.
NOTE 2 By agreement between manufacturer and user, additional limitations may be applied to the cell voltages
for the capacity test.
14.7 The measured capacity C (Ah) at the initial average temperature v is calculated as the
product of the discharge current (in amperes) and the discharge time (in hours).
14.8 If the initial average temperature ν (see 14.3) is different from the reference
temperature (20 °C or 25 °C), the measured capacity shall be corrected by means of the
following equation to obtain the actual capacity C at the chosen reference temperature of
a
20 °C or 25 °C:
C = C /[1 + λ (v − 20 °C )] Ah
a20 °C
or
C = C /[1 + λ (v − 25 °C )] Ah
a25 °C
The coefficient λ shall be taken as 0,006 for discharge slower than the 3 h rate, and 0,01 with
discharges with faster rates.
NOTE To conv
...