I just bought a cell phone battery on Ebay. The thing is twice as thick as my old cell phone battery so even though it fits on the back of my phone, it doesn't fit in my charger so I have to use the car charger on it. Also, my leather cell phone case doesn't fit anymore so that's $30 down the drain.
I looked on Ebay, and no one sells the thin battery anymore for some reason. Best Buy doesn't sell it either...I guess it was discontinued. Makes my 1/2 inch thick phone a 1/4 inch thicker though.
