in order to choose the perfect the ebike battery ,Please let us know the voltage you need.The higher the voltage the faster the bike speed typically and more power going up hills. Amp hours are important to look at as well. The higher the amp hours the more range will be achieved. Please note the battery voltage must be keep the same with the motor voltage. of course if you need the ebike case, please consult with our worker to the case type you need .thank you