noeifevo 14 6v 8a lifepo4 battery charger for 4s 12v 12 8v lifepo4 battery with lcd display cooling fan automatic shutoffDue 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 purchasing 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 can