Well, for me, since I consider removing the back panel twice a day annoying, I have chosen external battery solution (true, this is relative for now I am hauling another gadget around ). Beware though! Not all batteries work well with N900. For example there are reports that ZAGG Spark doesn't even begin charging (issue related allegedly to lower input voltage as opposed to standard 12V or what). However, PROPORTA'S LINE is reported to work flawlessly and you can find them locally on Amazon. Check out theirs USB TurboCharger 3400 World Pack which I consider the best companion to any N900 out there! No, I don`t work for them, It just works for me