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The major problem is still how to create fuel cells small enough to fit neatly in a mobile device and with sufficient power. Another problem, especially for people "on the go" is that air transport regulations currently prohibit the carriage of methanol.
I think we'll seen better display technologies before we see fuel cells hitting the market. And who knows... with the better less battery-eating displays, maybe we won't even need fuel cells for the next time.
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