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A handful of little white pellets holds enough hydrogen to fill a good-sized balloon.  At least, that’s the claim of executives at Cella Energy, a spinoff of Oxford University researchers.  The blog has covered their work twice, once with their claim that their hydrogen pellets could replace gasoline for the equivalent of $1.50 a gallon, and once for showing a method for pumping fresh pellets into a fuel tank after extracting the spent pellets. Their latest project, partnering with L2 Aerospace, converts a small unpiloted aerial vehicle (UAV) to run on hydrogen powering a fuel cell. The partners have been flying the UAV since January, 2014 and are now showing it at different expos in America and Europe.  The power …