Powermonkey is a useful gadget for any smartphone user – you can get a solar power addon. Yes, it doesn’t fix the problem. Even the double size extended batteries sold on ebay from the likes of Mugen (v good manufacturer btw) still require a different battery cover. I upgraded my HTC HD2 from Windows mobile to Android and thought the battery was ruined – in fact, the sheer useability of Android meant that I was using it a lot more! but I would still happily pay good money for 3x battery life.