noeifevo 13 8v 14 7v 5a 6a 7a 8a lead acid battery charger for 12v lead acid battery cooling fan automatic shutdown blackDue to certain 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 polarity is 1+ for positive and 2 for negative. If you require a different polarity, please let us know. Contact options: You can