Interesting🤔...<br>Makes me wonder about <b>angular momentum batteries</b><br>Chemical batteries have storage limit, but kinetic energy is not limited.,(reply>), Yes and no. There are going to be limitations imposed by what you use to spin up the flywheel and extract the energy from it and others from what the flywheel is made from. The fact that it could well be possible to store a lot more energy in a flywheel is probably right, though.