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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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I looked around and found that lithium ion batteries will range from 100-270 Wh/kg and up to 10 kW/kg.
So these particular batteries are sort of an improvement, less energy by weight but better power if I understand correctly. Definitely not an expert.