noeifevo 12 6v 5a 6a 7a 8a 10a lithium charger for 3s 11 1v li ion lipo batteries cooling fan automatic shutdown blackDue to some batteries with M25 charging connections 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 polarity is 1+ for positive and 2 for negative. If you require a different polarity, please let us know. Contact options: You can