| Cell phones free from nightly recharges. Laptop computers that run without needing an outlet. Pocket TVs with enough power to show a Ken Burns documentary.
 Portable gadgets are demanding more juice, yet a viable alternative to rechargeable batteries could be years away. But when it comes, it might work like the device about the size and weight of a deck of cards in William Acker's hand.
 
 It's a micro fuel cell.
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