IEC 62973-4:2021

Railway applications - Rolling stock - Batteries for auxiliary power supply systems - Part 4: Secondary sealed nickel-metal hydride batteries

IEC 62973-2:2020

Railway applications - Rolling stock - Batteries for auxiliary power supply systems - Part 2: Nickel Cadmium (NiCd) batteries

IEC 62973-1:2018

Railway applications - Rolling stock - Batteries for auxiliary power supply systems - Part 1: General requirements