Peel away the hype, labels, and the price, which probably exceeds my wifes and my own lifetime total earnings and you have this.
Flywheel energy storage - Wikipedia, the free encyclopedia
Now make this battery reasonably cost effective and you have a real electric car, no new tech chemical batteries needed, quickly rechargeable, and almost infinite life expectancy, just not affordable.
But we can dream, right?
regards
Mech