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I think this guy is onto something...

Liquid metal batteries will be better than gravity storage IMHO.

First commercial scale system is going live in 2021 so we shall see how it works out.

I don't understand how that would be feasible... wouldn't the battery need to be kept at a really hot temperature somehow to function?

Using it causes the heat. It is in an insulated container so the heat stays around for about 4 hrs I think he said.

So applying first charge must heat it to melting temperature but then it's working.

Then when you discharge it, electron flow cause heating again. So if it is constant use it just works.