EN IEC 62877-1:2023

SLOVENSKI STANDARD
01-januar-2024
Elektrolit in voda za oddušne svinčeve akumulatorje - 1. del: Zahteve za elektrolit
Electrolyte and water for vented lead acid accumulators - Part 1: requirements for
electrolyte
Elektrolyt und Wasser für geschlossene Blei-Akkumulatoren - Teil 1: Anforderungen an
den Elektrolyt
Electrolyte et eau pour accumulateurs plomb-acide ouverts - Partie 1: Exigences pour
l'électrolyte
Ta slovenski standard je istoveten z: EN IEC 62877-1:2023
ICS:
29.220.20 Kislinski sekundarni členi in Acid secondary cells and
baterije batteries
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62877-1

NORME EUROPÉENNE
EUROPÄISCHE NORM October 2023
ICS 29.220.20 Supersedes EN 62877-1:2016;
EN 62877-1:2016/AC:2017-05
English Version
Electrolyte and water for vented lead acid accumulators - Part 1:
Requirements for electrolyte
(IEC 62877-1:2023)
Electrolyte et eau pour accumulateurs plomb-acide ouverts Elektrolyt und Wasser für geschlossene Blei-Akkumulatoren
- Partie 1: Exigences pour l'électrolyte - Teil 1: Anforderungen an den Elektrolyt
(IEC 62877-1:2023) (IEC 62877-1:2023)
This European Standard was approved by CENELEC on 2023-10-18. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62877-1:2023 E

European foreword
The text of document 21/1169/FDIS, future edition 2 of IEC 62877-1, prepared by IEC/TC 21
"Secondary cells and batteries" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 62877-1:2023.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2024-07-18
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2026-10-18
document have to be withdrawn
This document supersedes EN 62877-1:2016 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 62877-1:2023 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 62485-2 NOTE Approved as EN IEC 62485-2
IEC 62485-3 NOTE Approved as EN 62485-3
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 62877-2 - Electrolyte and water for vented lead acid EN 62877-2 -
accumulators - Part 2: Requirements for
water
IEC 62877-1 ®
Edition 2.0 2023-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrolyte and water for vented lead acid accumulators –

Part 1: Requirements for electrolyte

Electrolyte et eau pour accumulateurs plomb-acide ouverts –

Partie 1: Exigences pour l'électrolyte

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.220.20  ISBN 978-2-8322-7424-8

– 2 – IEC 62877-1:2023 © IEC 2023
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Preparation of electrolyte for lead acid batteries . 7
5 Physical properties of diluted sulphuric acid as electrolyte . 8
5.1 Dependence of sulphuric acid electrolyte density on temperature . 8
5.2 Relationship of acid electrolyte density at 25 °C with the content of sulphuric
acid. 8
5.3 Electrolyte density in relation to the state of discharge . 9
6 Requirements for sulphuric acid used as electrolyte . 10
6.1 Impurities of sulphuric acid at high concentration . 10
6.2 Impurities limits of sulphuric acid electrolyte for first filling . 10
6.3 Impurities limits for sulphuric acid electrolyte in operation . 11
7 Storage of electrolyte . 11
8 Remedy in the event of damage due to the electrolyte . 12
Bibliography . 13

Table 1 – Correction factor to convert the acid electrolyte density found at the
measuring temperature to that at the specified reference temperature . 8
Table 2 – Acid electrolyte density at 25 °C versus percentage of sulphuric acid . 9
Table 3 – Maximum allowed impurities in diluted sulphuric acid in the density range
d ≤ 1,30 kg/l when used as filling electrolyte for lead acid batteries . 10
n
Table 4 – Maximum allowed impurities in diluted sulphuric acid in the density range
d ≤ 1,30 kg/l when this acid is acting as the operating electrolyte in lead acid batteries . 11
n
IEC 62877-1:2023 © IEC 2023 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTROLYTE AND WATER FOR VENTED
LEAD ACID ACCUMULATORS –
Part 1: Requirements for electrolyte

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 62877-1 has been prepared by IEC technical committee 21: Secondary cells and batteries.
It is an International Standard.
This second edition cancels and replaces the first edition published in 2016. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Addition of the concentration values of halogens in Table 4.

– 4 – IEC 62877-1:2023 © IEC 2023
The text of this International Standard is based on the following documents:
Draft Report on voting
21/1169/FDIS 21/1172/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 of the IEC 62877 series can be found, under the general title Electrolyte and
water for vented lead acid accumulators, 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,
• replaced by a revised edition, or
• amended.
IEC 62877-1:2023 © IEC 2023 – 5 –
ELECTROLYTE AND WATER FOR VENTED
LEAD ACID ACCUMULATORS –
Part 1: Requirements for electrolyte

1 Scope
This part of IEC 62877 applies to electrolytes and their components used for filling vented lead
acid batteries with dry-charged cells and for electrolyte replenishment, replacement or
electrolyte density adjustment of batteries in operation. This document defines t
...