noeifevo 73v 6a lifepo4 batterieladegerat fur 64v 20s lifepo4 batterien automatische abschaltung oled display aluminiumgehause mit lufterDue 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 polarization is 1+ for positive and 2 for negative. If you require a different polarization, please let us know. Contact options: You