Charge your phone with the heat energy in a cup of hot coffee (video)

Credit: Epiphany Labs/ KickStarter

So how does that work? I haven't seen one, but the claim is they use a small Stirling engine which utilizes difference in temperature to turn a crank. That implies a small generator which actually produces the electricity to charge your phone.

Cold drinks work too!

http://the-gadgeteer.com/2013/02/14/use-that-cup-of-joe-to-charge-on-the-go-with-one-puck/

http://www.kickstarter.com/projects/epiphanylabs/epiphany-one-puck?ref=category

Video:

http://www.youtube.com/watch?v=h_XzSnqo4Ps&feature=youtube_gdata_player

http://www.youtube.com/watch?v=_j_N5l_pgEc&feature=youtube_gdata_player / charge your phone on the go The Epiphany onE Puck Epiphany Labs Kickstarter project unique portable charging device uses heat cold temperature difference energy flow charge your phone small Stirling engine power to charge your phone USB charger drawing 1000 mA one Amp or less Kickstarter project funding starts at T tee shirt window sticker custom-engraved delivery in March 2014 ice cool cold hot tea coffee drink side red blue /