IEC 62133:2012 is available as IEC 62133:2012 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. IEC 62133:2012 specifies requirements and tests for the safe operation of portable sealed secondary cells and batteries (other than button) containing alkaline or other non-acid electrolyte, under intended use and reasonably foreseeable misuse. This edition includes the following significant technical changes with respect to the previous edition:< br /> - update of assembly of cells into batteries (5.5); - addition of design recommendations for lithium system only (5.6.2); - separation of nickel systems and lithium systems (Clause 6); - addition of specific requirements and tests for lithium systems (Clause 8); - addition of charging of secondary lithium-ion cells for safe use (Annex A). The contents of the corrigendum of June 2013 have been included in this copy.