Over 95% of global energy storage is in pumped-hydro facilities. Its storage efficiency is ~70-80%, with some claiming 87%... which isn't hardly 'inefficient' compared to lithium-ion batteries at 80-90% (and for way, way less cycles than a pumped-storage facility).
Batteries are wildly resource and labour expensive, and only marginally more efficient than pumped-hydro storage, which, again, is why it accounts for almost all of global energy storage.
Over 95% of global energy storage is in pumped-hydro facilities. Its storage efficiency is ~70-80%, with some claiming 87%... which isn't hardly 'inefficient' compared to lithium-ion batteries at 80-90% (and for way, way less cycles than a pumped-storage facility).
Batteries are wildly resource and labour expensive, and only marginally more efficient than pumped-hydro storage, which, again, is why it accounts for almost all of global energy storage.