So I've been getting pretty terrible battery life with my HTC Incredible S, so I decided to invest in one of those extended batteries from amazon. You have to get a special fat cover and the bigger battery and it's supposed to double your battery life. Does anyone have actual experience with these? I've read on some other forums that these batteries are basically scams and that they are not compatible with most devices because they are produced by 3rd party manufacturers. Apparently, they sometimes stop half way through and refuse to continue the process. Has anyone had experience with these extended batteries? How have they interacted with your Androids?