OK, so I had the 3500 mAh extended battery from my Hero and even though I sold the phone, I kept the battery. When I got the EVO and everyone was complaining (even me) about the battery, I put it in my EVO and HOLY CRAP BATMAN ... I got 15+ hours the first day (and I abused the hell out of it - games, 4G, email, surfing and of course, making calls!) I took it off my charger about 7am and by 10 pm I was at 43%. Instead of waiting for a company to develop a backing, I found this little diddy at a local kiosk ... and it works FANTASTICALLY! All I know about this case is that it is called HEX case - don't know who makes it tho. It cost me $10. I took pics, but for the life of me, I don't know how to post them. Any help?