★Note: This rear rack type battery is divided into two different kinds Specification: Battery material: li-polymer Nominal voltage: 36v/48v Rated capacity: 11Ah/14.5Ah Charge current: 2A Charging mode: CC/AC AC input: 110-240v,50/60HZ Max charge voltage: 42v/56.8v Cycle life: About 1000 cycles Charging time: 5 hours Range with one charge: 24 miles(motor 500w) Battery size: 13.58" x 5.90" x 3.34"(36v) Package Content: 1x battery 1x battery holder 1x charger 2x keys 1x power cord 1x charger manual Notice: Please check the compatiblity between your electric bicycle motor and our battery prior to purchase. The battery is highly recommended to be used with the charger that comes within the package as they are compatible with each other. Recommended to be used with 36V(250w-500w)/48V (250w-1000w) electric bicycle motor