You put in water, and get out water + energy? Unless there is some kind of nuclear reaction (which there isn't) it doesn't make sense. Has anyone found an explanation for how they work?
*edit* This is pretty much what I expected. The title to this article is misleading. Water is not fueling the phone. The enery is stored in the metal which eventually gets exhausted.
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In this case, the "fuel cell" is really a battery. The water combines with an unspecified metal inside the cell, liberating hydrogen in the process, and oxidizing the metal. The hydrogen then runs the fuel cell. When the metal is exhausted, the battery stops working. A LOT of energy went into making the reactive metal- and the net energy value of this fuel cell is low.
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