1. First, find the screw hole on the key. Usually, the battery cover of Borui Key has a small hole into which a small screwdriver or similar tools can be inserted. Use a screwdriver or similar tool to loosen the screws on the battery cover and take them out.

2. Secondly, remove the battery cover from the key. You may need to gently pull up the battery cover with your fingers or gadgets. Take out the old battery and discard it. Please pay attention to the positive and negative directions of the battery, so as to install the new battery correctly.

3. Finally, put the battery cover back on the key and tighten the screws with a screwdriver or similar tool.