Samsung's been toying around with fuel cell batteries for about three years, but now it means business. Rolling out first to the military, this ethanol-powered fuel cell is set to power military paraphernalia next year. But it's not going to run laptops for a month as originally promised.

This DMFC (Direct Methanol Fuel Cell) design uses methanol to create hydrogen for the fuel cell reaction, powering a laptop for 72 hours. Now all they need to do is get the weight down, because these hotshots top the scales at a hefty 7.7 lb — but still maybe light enough to be considered wearable.

Samsung, via Engadget