Just received my two batteries and battery dock i got off ebay for $12 total. It was coming from Hong Kong so i thought it would take forever but I ordered them on june 6 and received them almost exactly a week later. Already tried them and they both seem to work good right off the bat. I will update after fully charging and testing for a day. If works good I suggest you use this seller their name is ly.world I researched and many htc batteries work in the evo these were the cheapest for htc touch pro2, and tilt2. but others work also. the batteries are 1500mah just like the original that came with the evo. The battery dock has a large red light that turns green when charged and has a usb port for charging the phone while the extra battery is charging.