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Donut Lab's miracle battery found to be a fraud, investigation claims
(interestingengineering.com)
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this post was submitted on 09 Jun 2026
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However they don't mention heat threshold. Other analysis showed the battery withstanding well over the temps lithium ion would, even with a punctured vacuum. I personally don't believe the crazy 400 figure, but I'm not sold either way on it being a lithium ion battery just yet.