How to change the camera button cell?

The camera button is used to replace the battery. His steps are as follows: first, open the case of the video recorder, unscrew all the screws on the back of the hard disk camera case, then open the case, and you can see that a button cell is installed in its battery compartment next to the motherboard, take out the battery, replace it with a new one, and tighten the cover again, so that the hard disk camera can replace the battery.