This document describes steps, conditions and protocols for the safe maintenance and repair to facilitate the remanufacturing, reuse of battery systems, battery packs and battery modules designed for EV applications for alkali-ion (for example Li-ion, Na-ion), Pb, NiMH and combined chemistries. This document also includes an informative guidance on design and assembly techniques that facilitate the maintenance, repair, reuse a of EV battery systems, battery packs and battery modules (Annex B). NOTE 1 The repurposing and preparation for repurposing from an EV application to another one for which the battery system, battery pack or the battery module was originally not designed for is described in a separate document, EN XXX. NOTE 2 Individual cell replacement is only permitted when it is specifically allowed by the EV battery systems, battery packs and battery modules manufacturer.