Ben Heck’s has made a clever hand-crank mobile charger, which can be of a great help when your smartphones is not easy on battery.
If you have the basic know how of electronics and hardware, its pretty easy and straight forward. A USB port provides five volts of power which is why the crank worked with the HTC EVO and should work with practically any smartphone.
And if you are not geek enough, you can always buy a crank charger, works with all USB phones/devices.
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