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Yep, that's exactly right.

The only one that I saw in use was about the size of a grain tower, but I imagine you could use pretty much any size.

I know there was an electric car out quite a few years ago that used a molten-salt battery. This was of course before lithium batteries became quite as good as they are today. Dunno what they were thinking, as you would have to ensure you charged it every night before use the following day. Maybe they would be alright for something like a whole house battery backup though.

Yea, it sounds very interesting. Lithium Ion batteries are good for small storage, but they get really expensive and heavy when storing large amounts of energy.