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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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Most li-ions land around 120-160 W-h /kg. So much poorer, but much cheaper on density
The specific power (power density) is kind of crazy though. I think most li-ions top out around 10kW/kg, any more and they will overheat and boil their electrolyte which usually leads to fire.