I think they might mean something closer to a flow battery, where, in principle, you should just be able to replace the electrolytes in a discharged state with new electrolytes in a charged state. Current flow batteries have very low energy density, though.
I've always been partial to fuel cells, and in some ways they're ahead of the curve relative to standard batteries. For instance, solid electrolytes have been a thing for a while in fuel cells, and in both flavors of exchange. The challenge has always been overcoming sluggish kinetics with either better catalysts, or heat. It makes me wonder if there's a useful solid state battery that runs hotter than typical batteries, that would be useful for hybrid automotive applications.
I've always been partial to fuel cells, and in some ways they're ahead of the curve relative to standard batteries. For instance, solid electrolytes have been a thing for a while in fuel cells, and in both flavors of exchange. The challenge has always been overcoming sluggish kinetics with either better catalysts, or heat. It makes me wonder if there's a useful solid state battery that runs hotter than typical batteries, that would be useful for hybrid automotive applications.