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Re:What Will Happen to All the Dead Electric Car Batteries? by Eric_WVGG on Tuesday April 27, 2021 @03:02AM (#26952929)
My numbers almost exactly match yours. I’ve been using “Coconut Battery” for about fifteen years to track this on various MacBooks.

The death spiral starts at 80%. Newer Macs and iPhones now get pretty aggressive about pushing users to seek service.

Also worth noting that, as of Big Sur, MacBooks that are mostly used plugged-in will not too off past 80% until asked. I expect that this will pay off bigly for consumers.

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