I bought one of those 3500 mah batteries off ebay for only ten bucks and first let me say just how awesome. I'm not saying its a true 3500 battery but it kills the stock evo battery. The only thing i didnt like was the back door even though the cheap battery door is much nicer that the seidio one. I felt it made the phone too thick and i had the idea to not use any door at all and simply fit my case over the phone and hope it would hold the battery in place while protecting it and Im glad to say i got pretty good results using a cheap soft plastic case off ebay. Has anyone else tried this approach and got similar results?