I'm thinking that the thicker battery and cover will add some protection to the fragile camera location on the stock Evo. The case should position the camera up and awey from harm when the Evo is placed face down, I'd think. When the Seidio extended battery came out for the Pre, it had some problems with the flash glaring back into the camera and causing a distorted picture. To their credit, the realized their mistake, and sent everyone a redesigned battery cover that eliminated that problem. I also had problems with battery life on the first extended battery I got from them, and they replaced it 7 months later with no problems. I'd recommend Seidio's customer service.