IEC 62133:2012 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its 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: - 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).