On another forum, someone was discussing putting a 1750 battery made for the HTC Hero in the Eris. A forum member ordered it and it looks like they're saying that it fit. Here's the link: seidio battery? - Android Central Forums My only question is, the user says he/she recieved the battery and the case... does that mean you need a new back cover?? I was under the impression that the 1750 batter was the same size as the 1500 for the Hero??