Lithium battery features:1.Life expectancy is two times that of lead-acid batteries.The weight is more lighter2.No memory effect and rechargeable.the battery life is more longer3.Safer and more environmentally friendly, No heavy metals and hazardous substances.4.Built-in IC chip will prevent battery pack over charge, over discharge, over-current,over-heat, short circuit .5.Avoiding mechanical accidents caused by vibration.Product Details:Brand: LiitoKalaModel: 36V E-Bike BatteryCell: LiitoKala 21700 5000mAh 3C(Lii-50E)Category:Li-ion BatteryVoltage : Peak - 42V, working - 36VCapacity:15Ah/20Ah/25Ah/30AhPower: 150W-1000WCut-off voltage: 28VMax. discharging current: 60ampMax Continuous Discharging Amperage: 30AmpsRated Discharging Amperage: 30 AmpsCharging Current: <5 AmpsCharging Voltage: 42VoltsBattery Size :36V 15ah ;Size (220*65*75mm)36V20ah;Size(230*88* 75mm)36V25ah;Size(230*110*75mm)36V30ah;Size(230*130*75mm)Charging temperature: 0~45°CDischarge temperature: -20~60°CStorage temperature: -20~65 °CProtect battery temperature: 60°C plusmn 5°COutput and parameters: high current positive / negative connection column (red positive, black negative);