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Making it is just too inefficient. It'll be about double the cost of the electricity used to make it, so that's double whatever I would pay anyway. On top of that, available fuel cells just aren't cost competitive w/ available battery tech, even if they are lighter. Right now, storage costs for a pack that can degrade to 50% capacity, for instance in a PHEV like the Volt, are at ~10-15c/kWh. Until fuel cells can approach that, they're dead in the water IMO.
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