To replace the battery of the Kuken Q9 dual-mode Bluetooth mouse, you first need to find the battery compartment at the bottom of the mouse, slide the battery compartment cover open, and remove the old battery.
Then select the appropriate battery to replace according to the mouse model. Load the new battery into the battery compartment, and pay attention to the positive and negative direction to be consistent with the battery compartment logo.
Finally, slide the battery compartment cover to close and ensure that the mouse works normally.