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I don't know about this one, seems like we have better ways to store energy. Never mind the true range of these, that safety factor is what will keep them off the roads (hopefully, I'm still a little scared of the Chevy volt as I know how a small Lithium ion battery explodes). I heard, some years back, the French came up with a flywheel storage system; where when you hit the brakes the wheel was spun up, and when accelerating you used some of the wheels power. Then they did crash tests, and the wheel would shoot off in some direction with enough force to rip through another car. They switched to a ceramic wheel that would shatter, but I assume nothing has come of this, as I haven't heard about it since.
Anyone who has worked with high pressure tanks seems to think this is a bad idea. And as I imagine a cylinder flying at me from some relatively far away accident, I agree.
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