In most production cases, due to safety restrictions and manufacturers' considerations, the capacity of most built-in batteries is not very large, so it is recommended to use an external power interface for power supply. Generally speaking, the external power supply is basically provided by the cigarette lighter.
For example, in order to avoid the unsafe danger caused by high temperature, car recorders need to be equipped with built-in batteries. Because the device on the rearview mirror avoids direct sunlight, it will not reach the above high temperature. If you don't want to bother, you can use the most commonly used power supply method.
That is, the car cigarette lighter supplies power. This kind of power supply mode is the simplest long-term power supply mode, which is also adopted by many manufacturers and still dominates today. The camera angle of the driving recorder is mostly around 100 degrees, which can basically ensure the shooting of the lanes on both sides of the vehicle. When the video resolution is 1280 times 720, you can clearly see the front license plate.
This is mainly because the manufacturer considers the working environment and safety of the driving recorder, and the built-in battery capacity is small. Once the power supply is cut off, the battery will run out and a low battery prompt will pop up. Maybe the car hasn't been driven for a long time, because the car hasn't been powered on for a long time, and the battery of the driving recorder is almost dead.