Regular use of the Mobius camera as a dash cam can result in battery problems such as overheating. This is due to the continued power supply going through the camera. A capacitor allows the camera to function when powered and provides enough power once the camera has been disconnected to safely shut the camera down.
The capacitor simply replaces the battery by swapping them over. You will need to unscrew the back of the camera and swap the battery with the capacitor.