Dismantle the PS3 Wireless controller screw out.
Open the bottom cover of the PS3 wireless controller.
Change PS3 wireless controller battery.
Close the bottom cover then fasten the screw.
When PS3 wireless controller has power off, you can use USB charge cable. Insert the USB port on the console or computer, then insert the other end to PS3 wireless controller, it can prolong the using time of the PS3 wireless controller.