Oh, just buy SGS2 and buy a Mugen battery for that. Then if you really are into reasonable challenges, port Meego to that SGS2. And in the future, do not buy phones, like N9 or any Lumia, which have not easy-replacable battery and not easy back cover. Marko Ahtisaari may think they are pretty when batteries are unreplacable and deep hidden, but they are not suitable for a heavy user.