48V 13Ah 36V 15AH Electric Bicycle E-bike Battery Downtube 1000W 750W 500W MTB. Rated Voltage / capacity:48V / 13Ah, 36V /15ah, 48V /15ah. W:3.50KG/3.70KG. Batteries combinations:13-S, 6-P for 48v 13ah and 48v 15ah , 10-S, 6P for 36v 15ah. Component:Li(NiCoMn)O2. Discharge cycle life:1000 times(? 80%). Certification:CE, RoHS, MSDS. PCB board Protection: Yes. BMS board Protection:Yes.