This may have been reported before, but it looks promising. Key is that the theoretical chemistry may have an unlimited number of charge-discharge cycles.
The original Edison batteries effectively never wore out (if the chemicals degraded because the battery was not maintained, they could flush and refil with fresh electrolyte and they worked fine). This newer version with nano-stuff seems to suffer some degradation over time, but perhaps they will find a way to fix it.
The supplier I got my lithium battery from did show a nickel iron flooded prysmatic type (among a wide variety of other battery chemistries). Weight and efficiency concerns kept me from enquiring about them. I thought it was interesting to see a modern source was available.
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