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Your wrong on both accounts. Hydrogen stored DOES self discharge. in fact NO CONTAINER known to man can 100% contain hydrogen. Not one. Its one of the core problems with hydrogen and its DANGER when left in storage.
Batteries on the other hand ALSO self discharge but at a rate SO SLOW it might as well be ZERO self discharge compared to Hydrogen :-)
ie if you charged up a NIMH powered electric car after a 6 MONTHS of sitting you "might" lose 3 or 4 % of your charge. IE nothing in the bigger picture. a solar roof would take care of the very minor self discharge.
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