Lead-acid is not the cheapest way to store energy at scale. Grid storage is already a thing, and is primarily delivered with pumped storage hydro. The benefits

Lead-acid is not the cheapest way to store energy at scale. Grid storage is already a thing, and is primarily delivered with pumped storage hydro. The benefits of this are numerous. Very few moving parts, no toxicity, enormous storage potential, etc. The cost differential between this and other technologies is enormous.