First open the battery compartment cover at the bottom of the mouse, and then remove the old battery. According to the mark on the bottom of the mouse, put in the new battery correctly, making sure that the positive and negative directions correspond correctly.
Then close the battery compartment cover again, making sure the cover is secure.
Finally, the mouse will automatically connect to the computer, if there is no automatic connection, you can try to press the connection button at the bottom of the mouse until the light flashes, indicating that the connection is successful. So the mouse can be used normally.
Wireless mouse has charging, useful battery. There is also a battery compartment under the base, which can be replaced by opening it