Enter the Voltmaker, which so happens to be an Indiegogo project at this point in time, requiring a cool 200 grand for it to be realized in the flesh. The Voltmaker is a rachet-like device which enables one to juice up any compatible low-power electronic device, ranging from smartphones to MP3 players, and also doubles up as a backup battery which can be extended thanks to the wonders of add-on modules. Not only that, the code is freely available thanks to the wonders of the GPL license. With the Voltmaker, there is no more reason to have your batteries run out of juice, ever again, each time you are on the road.