I think you might not understand how a gravity battery works. You use the electricity to move water from a low basing up a mountain to a high basin. You then release that water and have it run through turbines to regenerate (a significant part of) the electricity you used to pump the water up. You don't store electricity, you store energy.

Oh, we call those things Pumpspeicher. Sure, and just how mucj of the total produced and consumed electricity is stored that way? The amount is negligible and the theoretical capacity limited.