...and we thought hydrogen fuel cell was the answer

I may be wrong about this but I imagine that if this new fuel cell can power a wrist watch, then I imagine that it's the same size as a wrist watch battery,

that would suggest that these cells can be built with the same power density as regular LiION batteries, just like the ones already used to power cars? -just a guess, I can't see as they'd have said it could power a watch if it was too big to actually power a watch!
 
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