Grid scale battery is just another word for a radioactive source in a powerplant. The battery life is basically double the half life. So cobalt60 fuel rod powerplants are the ultimate short term battery? Its basically a solid state energy breakthrough I expected to see on YouTube.
World's biggest battery being built is in Maine! Massive massive iron-air battery!
https://www.canarymedia.com/articles/long-duration-energy-st...
I do think redox-flow batteries are so cool. Something about these vast liquid resivours. The ability to filter out impurities & keep regenerating the battery as it would otherwise age... Neat. Example:
https://www.energy-storage.news/first-phase-of-800mwh-world-...