Flow batteries specifically are liquid, or more accurately fluid, there can be gas flow batteries, where the chemical sub-products are pumped in and out of the cells.
They tend to be large utility scale things that look like a chemical plant, correction, are a chemical plant with electrical storage as the product.
Liquid electrolyte batteries have been a thing from when batteries have been invented. But not much work has been done to really scale it up.
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Flow batteries specifically are liquid, or more accurately fluid, there can be gas flow batteries, where the chemical sub-products are pumped in and out of the cells.
They tend to be large utility scale things that look like a chemical plant, correction, are a chemical plant with electrical storage as the product.
Liquid electrolyte batteries have been a thing from when batteries have been invented. But not much work has been done to really scale it up.