Depends on your car. My older vehicle will continue to charge/output power whether or not the car is running. I have to unplug the dashcam or risk draining the car battery while I'm away. My other car, on the other hand, automatically cuts all power to the outlets when not running, which causes the camera to turn off. You may want to consider getting a small USB camera and a solar charger that you can leave on your dash with the camera attached. As long as it's charged and getting plenty of sun the camera would continue to record.