More than 20%
This yourself, but it is best to be ready to charge at more than 20%, so that it will not affect the life of the mobile phone battery, and ensure that it will not shut down because the power is too low
1. Press and hold the quick release button (long wrist strap end) to separate the wrist strap, and then plug the USB charging port into the charger with USB port or the USB port on the computer to charge.
2. Insert the charging metal piece of the bracelet into the charger metal piece in the middle of the USB port. When the power is connected, the bracelet will vibrate to remind.
3. When charging, the charging icon and power prompt will appear on the screen, and the main body will automatically turn on, otherwise, please change the charger direction and try again.
General mobile phone power will be less than 50% to charge, if the power is too low, it will have a certain impact on the battery.