Twirling Batteries: one step closer to the Spin Phone

Some time ago i did a post about the Spin Phone, a cellphone concept design that i saw over at Yanko Design, that charges by twirling it on your finger. Here check it out Spin Phone Design: Mechanical Retro meets Touch .

Now i just saw a post on Engadget that is bringing us one step closer to impementing this eco friendly design, THE TWIRLING BATTERY PACK. Here is the link:

Twirling battery concept promises a quick power fix