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" ... The energy density of liquid fuels is pretty much set in stone (sorry); if you want to go farther, you have to carry more of it, which adds weight, which then fluctuates as it is used. With batteries, the weight never changes. Also, batteries can often do the seemingly impossible: weigh less yet hold more power. Want proof? Buy an eight pack of AA alkaline batteries and an eight pack of AA lithium batteries. The lithiums are far lighter but last far longer. Miracle? No, just battery science, the same science that allows the SR/S’s lithium-ion battery to ferry a 505-pound motorcycle, my prodigious carcass and a bunch of heavy gear for well over an hour at speed, and then recharge over and over again to repeat the process. When you think about it, the fact that the Zero SR/S works as well as it does right now is a modern technological miracle. ... "