Voltmaker is another of those emergency charging solutions for your smartphone, mp3 players, GPS etc. It weighs about 300 grams and measures 6.1″ in length and 1.4″ thick. Housed inside is a 2,000mAh rechargeable lithium battery that plays a vital role in providing backup charging power but thats not the only thing Voltmaker does. When the internal battery also runs out of juice, you just need to open its arm and with just a few twists and revolutions, you are generating enough charge to make a few minutes emergency call from your smartphone or navigate your way through your handheld GPS. According to t he developer, this works on the principle of kinetic energy to generate electrical charge.
Currently the Voltmaker is a concept and in order to materialize this concept, $200,000 is required in funding. If you think that this invention is worth a shot then do not hesitate to back this project at Indiegogo.