Answer to "Where can I purchase a battery for a Dualshock 3?"install is simple 5 screws and unclip the old battery and unplug it and plug in the new one and install the new battery and don't forget to reset the controller there is a small hole on the back push it in with a paper clip and hold it for a few seconds and release it. charge it and resync it and should be good to go.
Answer to "Where can I purchase a battery for a Dualshock 3?"dealextreme.com for 3.99 and free shipping and comes with a new usb cable