Fuel Micro Charger is a really cool invention that looks to be going into production.  This portable charger is a little bigger than a quarter and smaller than a key and will give your phone an emergency charge equivalent to about 30 minutes of talk time.  It’s has a key ring attachment and seems much more practical than those bulky battery backs.  You can order yours today for as little as $18.00.

charging-fuel fuel_micro_charger_devotec

via Kickstarter