When it looks like your phone is about to run out of battery, you actually have plenty of juice to spare. The Voltmaker is a device that allows you to make use of that reserve energy in order to charge your phone — all with the flick of a wrist.

A hidden rod that is normally secured to the body using a magnet can be released using a spring-loaded mechanism. Once you release it, you can spin the rod by shaking the device like a rattle — a movement that allows your smartphone to harvest kinetic energy.

By keeping up your enthusiastic rattling for a few minutes, it’s possible to generate enough power to make a quick phone call, play a couple of songs or light the way using an LED torch attachment that fits into the USB port at the opposite end. Read more…

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It seems like you can't be too rich, too thin, or have too much battery power. That's where AmpTec's JuiceCAN can help, bringing you enough power to charge an iPhone 5 three times over. One of these cans can even charge up a power-hungry iPad a couple of times.

It works with anything that gathers power via a USB port, and this colorful device is scalable. That means you can stack these JuiceCANs into what the company calls a JuiceCane, giving you additional power when you need it.

Its stackable nature lets you add utility caps, which have myriad uses including USB ports, an LED flashlight and even, ahem, a vibrator. Read more…

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