For battery pack, please note the following tips: 1. Never drains your battery. When battery power shows low, stop! And Charge your battery! 2. Always charge your battery after each ride! 3. When you charge your battery, make sure unplug it as soon as it finished charging. Do not leave the battery on charger overnight! 4. Do not expose the battery to extreme temperature. 5. Make sure the battery is not exposed to fire or water. 6. Make sure the battery does not suffer impact damage. 7. Please make sure the battery is mounted properly on the bicycle and it will suffer excessive vibration, bumps or shakes during riding. 8. Take special care to ensure the discharge port of the battery does not sustain any pressure or force so it will not come loose or break. 9. When not in use for long period of time, make sure charge the battery to half full once a month.