Iron also doesn't catch fire easily the way lithium does. That's another win for energy storage at grid scale where they could place these at unmanned substations and not worry about them burning the place down unexpectedly. Or potentially - charge up an iron air battery overnight on the cheap midnight to 6am energy and then have it run DC Fast Charge stations during peak hours when energy costs are high. This would help the grid and also let you shift that energy from the cheap production hours to the expensive distribution hours.This means they wouldn’t be able to be used in smartphones or laptops or even electric vehicles, but could work well as a practical option for grid storage.
Locate the iron-air storage physically close to (or at) the DC-FC station rather than farther away on the grid and it means you'd not even impact the grid at all to do DC-FC during peak hours.