This bike battery is 36V 8AH, built-in A grade 18650 lithium cell, suitable for 200W-500W motor. Widely using for electric bikes, bicycles, mountain bikes and more.// LED battery level light can inform you of charging in time. The USB port can charge your phone and other devices when outdoor. The shell of this Electric Bike battery is made of lightweight and durable plastic that doesn't overheat with use.// With on/off button, save more power.