noeifevo 63v 6a lithium batterieladegerat fur 55 5v 15s batterie automatische abschaltung aluminiumgehause mit lufter silberDue to some batteries with M25 charging ports that have built in charging protocols, our charger cannot support batteries with integrated 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 need a different polarity, please let us know. Contact options: You can reach us