A Letter to All Customers:Wallenpower battery can fit most motor kits, for example: Bafang, Voilamart, CSC, Tongsheng, EBIKELING, etc. But exclude these four. Bosch, SHIMANO, Yamaha, Panasonic. The First: It is necessary to state that we have 10 years of experience in the production of lithium batteries, our battery capacities are absolutely genuine and reliable. WallenPower only use grade A cell for battery, safest packing process, never use cheap / false cells with false capacity / low price to attract buyers. Price = quality = customer’s service. Professional maintenance points ensure that there are no worries after sales. WallenPower batteries guarantee high quality. All our batteries in our factory, Professional imported machine spot welding, neat electric welding, cleverly designed the routing direction, good welding process. In the Last: The actual range depends on ebike load, riding habits, road conditions and the temperature is very importent for the battery. The lower temperature the less capacity of battery can output(The recommended temperature batteries is 25°C).