Application: Motor power is between 200W-1000W,ebike bicycle ,electric scooter,electric skateboard,power wheelchair. Specification : Rated voltage: 48VOutput Voltage: 35.7-54.6VCombination mode: 13 series 3 parallelNumber of batteries: 39 cellSingle cell size: 18mm diameter x 65mm heightBattery capacity: 9AhDimensions: 250*70*70mm (Can customized )Total weight: 1.95kg aroundInternal protection circuit: overload, over discharge, over current, short circuit protectionBattery cells inside : Big brand cells . Good quality Life Cycles :Over 1000 timesApplications:electric vehicles, model aircraft, electric tools, Battery pack diy,Golf carts, sightseeing coaches, electric Motorcycles,electric bicycles ,power wheelchairs And Others .Note:If the motor power is more than 1000W, please contact us via email, we can customize the matching battery for you, but you need to charge extra