Battery Health on iPhone 6s

Some time ago, I foolishly disabled the Performance Management feature that was enabled after an unexpected shutdown, because I did not know any better. This was OK for a while, but now I am starting to get these shutdowns again and cannot find a way to re enable the Performance Management. This started happening after the upgrade to iOS 15. Using Low Power Setting seems to help.

Searching the Apple Support site, I find that Performance Management cannot be re enabled manually. But it says...

Battery Health on iPhone 6s

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