I did already, here https://news.ycombinator.com/item?id=47176841 https://news.ycombinator.com/item?id=47176841 Also, 5 was a typo, it should have been 4 of co

I did already, here https://news.ycombinator.com/item?id=47176841 https://news.ycombinator.com/item?id=47176841 Also, 5 was a typo, it should have been 4 of course! Form energy has been making a major splash for years, having first modeled out the grid case for this type of battery, and ensuring that all materials and battery chemistry allowed a potential route to success. It's iron-air.