Finland has inaugurated an industrial-scale sand battery this week in the southern town of Pornainen, where it'll take over heating duties from an old woodchip power plant for the municipality. It's set to reduce carbon emissions from the local heating network by as much as 70%, and is the largest…
While it’s not a battery it mentions that they are working at heat conversion to electricity.
Yes, but even that would not make this a battery. Energy storage =/= battery. A battery is a type of energy storage, this is another type.