Yeah. And for big power banks, there are several options beyond Li-ion. There are sodium, iron and magnesium chemistries for one. Compressed air storage is ano

Yeah. And for big power banks, there are several options beyond Li-ion. There are sodium, iron and magnesium chemistries for one. Compressed air storage is another option, that is quite cheap and scales extremely well. The one being built by Hydrostor now in California is 4GWh, for example [0]. Refs: [0] https://newatlas.com/energy/hydrostor-compressed-air-energy-storage/ https://newatlas.com/energy/hydrostor-compressed-air-energy-...