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…
My bad, I had multiple wiki tabs open and got confused which one it was. I was quoting from the wiki on batteries, which the above wiki links to when it says an energy store “is generally called an accumulator or battery”.
So, at best, the wiki citation given by the user above cites another more technical wiki that immediately states the opposite of what’s being claimed.
Electric batteries are defined as a number of cells, made of electrolyte and metal contacts, arranged together to form a “battery” of cells. An electric battery is a type of energy storage device.
A “sand battery” is also an energy storage device, but meets neither the definition of “electric battery” or the general definition of “battery” as it is not a multiple of some unit. Thus it is not a battery. The only way it is a battery is as a marketing term.