stackyFACTSBatteries rely on fussy chemical reactions, but you can also just store energy by spinning a heavy object really, really fast.
Batteries rely on fussy chemical reactions, but you can also just store energy by spinning a heavy object really, really fast. A massive physical rotor is suspended in a vacuum to eliminate air friction and accelerated on magnetic bearings. As long as it keeps spinning, it acts as a mechanical battery holding pure kinetic momentum. When power is needed, you simply tap the rotational force to spin a generator, slowing the wheel down in the process.
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