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Pretenders to power: fuel cells must now prove they are the heir apparent to batteries.(Mobile Technology)

The arrival of fuel cells as new power sources for portable electronics is a fait accompli that's yet to be accomplished. Yes, fuel cell engineering is as advanced as it has ever been, and the reigning battery chemistry, lithium ion, is about as advanced as it is going to get, but fuel cells remain untested in the marketplace.

Next year fuel cell developers--a mix of electronics heavyweights such as Toshiba Corp., NEC Corp. and Motorola Inc. and small, focused startups--will change that by rolling out their first products. Those initial fuel cells will power external chargers for laptops and phones, acting as alternatives to the wall socket. In the longer term--at least a ...

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