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→Lithium-Air Batteries
<ref>http://www.sciencemag.org/content/350/6260/530.abstract</ref>
<ref>http://singularityhub.com/2014/10/28/new-solar-cell-doubles-as-battery-to-store-the-energy-it-creates/</ref>
In other words, if you had a battery the size of your gas tank, the range of travel would be roughly the same.
Another advantage is that lithium-air batteries have a solid-state design that is attractive from a safety standpoint. It eliminates the possibility of rupture and ignition.