Description Built in Automatic Battery Protection System Internal Automatic Low Voltage Disconnect : 25V(36V ebike battery) /32.5V(4 8V ebike battery) Automatic Short Circuit Protection Instant Automatic Over Voltage Protection : 42V(36V ebike battery)/54.6V(4 8V ebike battery) Rated Voltage: 36V/48V Charge Voltage :42V(36V ebike battery)/54.6V(48V ebike battery) Capacity (amp hours) : 10Ah/20Ah Continuous Discharge Current : 30Amp/35Amp Size (L x W x H): 36V 10AH–2059370mm/8.13.62.8inch 36V 20AH–21013870mm/8.35.52.8inch 48V 10AH–2609370mm/10.33.72.8inch 48V 14AH–27010770mm/ 10.64.212.8inch 48V 20AH–27014070mm/10.65.52.8inch Cell Type : A+++++.