Twirling cell phone battery
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A lot of times, we are stuck out in public without our phone chargers handy. This leaves us vulnerable especially when we need to make an important call.
This idea about a twirling battery is really cool. The concept is to simply twirl the cell phone battery around a finger a few times for a quick bit of juice to send a text or make a call. 130 twirls will give you approximately two minutes of talking time.
The same idea could also be applied to batteries for other devices.