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Yeah my 2021 M1 Pro is showing 89% battery. My spare 2021 M1 Pro is showing 99% battery.

(Also I have a spare iMac and a spare Mac Mini and an iPad I can work on)

YMMV but redundancy is good.

FWIW my M1 Air 2020 is at 93% health. We could speculate about the potential root cause of this different (I always use optimized charging and the author appears to have it disabled on their screenshots)... but it's quite more likely that it's simply bad luck of the battery draw.

I'm at 84% on this M1 MBP that I've been using for 2 years, I'm not too far off from his numbers.

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