noeifevo 36v 10a lead acid battery charger charging voltage 41 4v 44 1v automatic shutdown oled display aluminum casing with fanDue to the fact that some batteries with M25 charging connectors 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 options: You