When do I need to replace the battery?

Up to 500 charge cycles. Lithium ion (Li-ion) batteries like to be kept charged at around 80% of full capacity and have no memory effect. Charging after partial use is called a  partial charge. A full charge cycle is when the battery power has been depleted and then charged back to full. Do not store the battery fully charged or fully depleted. Please refer to the battery performance sheet provided when you purchased from BF e-Bikes.