noeifevo 43 8 v 6 a lithium batterieladegerat fur 38 4 v 12s lifepo4 batterie automatische abschaltung aluminiumgehause e bike roller elektromotorradDue to some batteries with M25 charging connectors that have integrated charging protocols, our charger cannot support batteries with built in charging protocols. Please confirm with the battery supplier before purchase whether the battery has an integrated charging protocol. For M25 (2+1+5) and M25 (2+4), the standard polarity is 1+ for positive and 2 for negative. If you require a different polarity, please let us know. Contact: You can reach us