Next day, comment, mostly to myself as an alternate way of writing the above. In a hydrogen fuel cell: Storage: electricity + water -> hydrogen + oxygen. Hydr

Next day, comment, mostly to myself as an alternate way of writing the above. In a hydrogen fuel cell: Storage: electricity + water -> hydrogen + oxygen. Hydrogen is stored. Consume: hydrogen + oxygen -> water + electricity In the iron-air cell: Storage: (electricity + water) + rust -> oxygen + (hydrogen + rust) -> oxygen + water + iron. The iron is stored. Consume: (iron + water) + oxygen -> rust + (hydrogen + oxygen) -> rust + water + electricity Not as readable as I thought writing it.