Lithium- Ion 7ah Battery for Ersin 350-20What makes this battery special is the charge cycle. its capable of 1000 charge cycles. While many others are only as good as 500 700 charge cycles. The battery is able to continuously discharge 36V for an extended period of time. This Battery will outlast in durability and power compared to any other batteries. When it comes to E Bikes the main thing is the Battery, the Heart of the bike! this is what provides all the power, weather the bikes hits 10