If there is a good enough economic impetus, it will enter commercial use quickly. Also, things like iron air batteries are relatively extremely simple - it's no

If there is a good enough economic impetus, it will enter commercial use quickly. Also, things like iron air batteries are relatively extremely simple - it's not like there is complicated chemistry to figure out. When it comes to grid scale storage, I think there will be rapid advancements because the constraints for what what makes a good grid battery is so different from what makes a good laptop or EV battery, and we've really only recently been investigated batteries with those constraints. I.e. for decades battery tech has been concerned about things like weight-to-capacity ratios, recharge times, etc. Most of that hardly even matters for fixed, installed batteries at power plants.