Pumped water is about the only practical gravity battery, but it has limitations.
- It can only be built in a few geographical locations.
- This tends to limit it's overall capacity unless you're Norway or Switzerland.
- It requires flooding an area to make a storage lake and so has a high environmental impact.
- Building power stations inside mountains is difficult and expensive.
So it's great stuff, but I don't think it's going to be the backbone of any storage solution we have.