The built-in battery of your device is only used for saving the last video file when the external power source is cut off. Do not use the device without the external power source.
Avoid to use the device in an extremely high temperature as this may damage the battery of the device. If your car still supply power to the cigarette lighter after it is stopped, when it is parked in an area that exposes it to direct sun rays in summer, please plug out the power cable of the device to turn the device off.
Do not disassembly the built-in battery by yourself.
In case of any high temperature, deformation, expansion or liquid leakage of the battery, please stop using it immediately and contact the after-sales service center.