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China's new iron battery hits 99.4 percent efficiency over 6000 cycles
(interestingengineering.com)
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this post was submitted on 29 Apr 2026
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IF is doing quite a bit of heavy lifting there.
And yes IF it is as you said HALF that good, in either direction— the article mentioned ~80% under heavy loads. And that alone would be a game changer.
Energy storage is the “oil” of the future.
IF — we shall see. But I’m hopeful