noeifevo 43 8v 2a 3a 3 5a 4a lifepo4 battery charger for 12s 36v 38 4v lifepo4 battery cooling fan automatic shutoff redDue to some batteries with M25 charging ports that have integrated charging protocols, our charger cannot support batteries with built in charging protocols. Please confirm with the battery supplier before purchasing 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 need a different polarization, please let us know. Contact options: You can