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New nickel-iron battery charges in seconds, survives 12,000 cycles
(interestingengineering.com)
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this post was submitted on 13 Feb 2026
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Looks like it's more like NiMH than LiPo, but higher power than NiMH (which I guess lines up with their claims of charging super fast).
It's more like NiCd but better power and more cycles (and no memory effect).