So I've had an Evo for about 2 months. I know I'm about a year late to the party but better late than never. I was looking for a case and settled with an Otterbox Defender as I work in the trades and this is my first phone in 9 years that didn't meet military specs for dust and vibration. My Nextel i58SR fell out of my truck once into the road and was fine when I went back to pick it up. A great phone. Anyway, I had seen so many threads about battey life and I feel like I've gotten mine pretty well sorted but figured I'd try an extended battery. I thought the "extended" ones that fit under the cover may be too good to be true so I found a 2150 mah HTC battery with a cover on Ebay. It's an HTC battery and I felt good about it. So here are some pictures of the new battery with cover and an Otterbox Defender. The Batteries. Stock on the left and 2150 on the right. Shot at 2011-08-25 The covers. On the Phone This is where it gets interesting. I originally tried to fit the 2150 without the back cover for the phone and it didn't fit. So i cut the back of the Otterbox andlet the small hump fit out the back and then the rubber case goes over it. I did lose the kickstand on the Otter but it was already cracked. Shot at 2011-08-25 All put together with the hard case of the Otter. The rubber outer case installed. To cut out the back of the Otter I used a drill and then a small hacksaw blade to get the rough square. Then I fine tuned it with a razor knife just kind of whittling it down. It ended up fitting really well and the only extra thickness added to it is the rubber over the back. The hard case fits nice and snug and the rubber outer protects it. I'm very happy with how it came out and also with the power of the 2150 battery. Any questions feel free to ask, and this is a great forum! Thank you!