This may be due to the high temperature of the device, or insufficient electricity supply from the USB port. Try one of the following methods to solve the problem:
- Charge the battery with the scanner cover closed.
- Make sure the electricity supply of your USB port is sufficient. Does it comply with the USB standard (5 V 500 mA)?
- Use the bundled USB cable to connect to the computer directly. An extension cable or USB hub may not provide sufficient amount of electric power.
- Use the adaptor that is sold separately to charge the battery.