The Power of Sand Batteries
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The Power of Sand Batteries -- Revolutionizing Energy Storage...
https://youtube.com/watch?v=MFgWBHRhCn0
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Crosspost from the "Energy" Community. Seemed too good not to put here.
Sand battery sounds like something someone would call me in a call of duty lobby
That's a good article. Ten times less efficient than a chemical battery, but 10 times cheaper, and the only component that ever needs to be replaced is a cheap fan that pumps the air through the battery.