For those who are looking for an extra battery I purchased a couple from one site and it showed up as unknown in the battery meter also it did not fit.
So I decided to try these guys out at -->
http://cgi.ebay.com/2x-Battery-USB-A...713.m153.l1262
The battery fit perfectly and my Sprint TP recognizes the battery as well letting me know how much charge is remaining. On another note, the screen protector did not match (not even close), but I was more interested in the batteries and the charger (one for me another for my wife)
Hope this helps =D>