[Armisael16]

It’s less efficient than normal electric batteries and will take up far more space.

Gravitational storage only works in the very particular case of water, where moving it is downhill nearly perfectly efficient and free, and where you can also get free energy from things like rivers feeding in.

[dumpsterdiver]

Yeah, now that you mention it I suspect that the mechanical stress upon a system that lifts dirt (as opposed to one that pumps water) would result in expensive routine maintenance, and possibly even catastrophe (i.e. the chain breaks).