IEC 62133-2:2017+A1:2021 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 first edition cancels and replaces the second edition of IEC 62133 published in 2012. It constitutes a technical revision.This edition includes the following significant technical changes with respect to IEC 62133:2012:- separation of nickel systems into a separate Part 1;- inclusion of coin cell requirements;- update of assembly of cells into batteries (5.6);- mechanical tests [vibration, shock] (7.3.8.1, 7.3.8.2);- insertion of IEC TR 62914 within the Bibliography.