If I understand correctly, the Evo uses the same battery as the Hero, which uses the same battery as the Touch Pro 2. I have one of these for my Hero, and I figured some of you will be needing one soon >.> It won't make your battery last longer, per se, but it doesn't drain nearly as fast under intense usage. Its kind of hard to explain, but basically you get more use out of the battery during a given time, while standby time stays mostly the same. I definitely recommend getting one though, its worth the whopping $10 you pay. If anyone is interested, they can be found here (for now, anyways): 2000mah Spare Battery for HTC Touch Pro 2 T7373 Sprint - eBay (item 390187525611 end time May-24-10 22:30:18 PDT) Did I mention its the same size as the stock battery?