1.Use original battery charger, use of other models or brands may bring about safety issues; 2.Don’t run out of the battery for your each ride. Normally when the battery power comes to 20%, try to fully charge the battery to prolong its life span. 3.Do not leave batteries unused for extended periods of time. Charge or discharge the battery to approximately 50% of capacity before storage. Charge the battery at least once per two months. Store the battery separately from the product in a dry and ventilated environment.