Charge Your Phone Just by Walking

A new device that channels kinetic energy and fits in your backpack.
Courtesy Tremont Electric

The new nPower PEG allows users to charge mobile devices without an outlet, without sunlight or wind—without anything but a little bit of motion. Users, for instance, can throw it in a bag while they’re walking, strap it to a bike, or take it jogging, and then plug in their phone to recharge it. Movement causes a spring-mounted magnet to bounce and pass repeatedly through a coil, charging the battery. It’s especially useful for people who need to power their mobile devices while they’re off the grid.

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