Phone out of juice? Just twirl this tube charger

You wouldn’t want to spend hours twirling Voltmaker to fully charge it, but a brief spin works in a pinch.

(Credit: Indiegogo)

If you’re far from the grid and your smartphone battery is running out, you’d better have a backup if there are no other phones around. This recharger gives you power with a flick of the wrist.

Voltmaker is an award-winning, patented design and Indiegogo campaign for a USB charger that can give you emergency power by spinning the dynamo. The 6-inch, 10-ounce device can also be recharged on a standard outlet.

If your phone is dead and you’re hiking in the woods, spinning Voltmaker for two minutes will generate enough power for a phone call lasting several minutes, according to the campaign.

Fully charging Voltmaker’s 2,000-mAh battery manually, however, would take two to three hours, so the crank is really for emergencies.

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