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Flow batteries have been around for a while. First I've heard of trying it with Lithium chemistry.
http://www.technologyreview.com/energy/26023/page1/
http://www.technologyreview.com/energy/26023/page1/
Last I checked fuel cells didn't store any energy.As with fuel cells, the new battery can store large amounts of energy without also needing large amounts of supporting materials to extract it, Chiang says.
the fuel tanks store the energy the fuel cells convert it . they do continue to carry a charge without fresh reactants like a capacitor .Last I checked fuel cells didn't store any energy.