noeifevo 72v 3 5 a lead acid battery charger oled display aluminum case intelligent quick charger crocodile clamps m8 iec c13 rcaSince some batteries with an M25 charging connector have integrated charging protocols, our charger does not support these batteries. Please check with the battery manufacturer before purchasing to confirm 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 information: You can reach us