So instead of wasting time by plugging batteries into a charger, why not charge them by your hand? Designed by Qian Jiang, winding up the batteries for five minutes will give them maybe 45% of battery life. This would be great for emergencies when there is no electricity.
Link:
http://www.tomsguide.com/us/rechargeable-battery-emergency-battery-wind-up-battery,news-10847.html
That would be nice if they could do that for phones. I've had a couple flashlights that work on that principle, but I haven't heard of it being applied to other devices.
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