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What's happening here? Not nice.

I understand him. I mean Apple gives us this option to look at, if voluntary or not. So of course we look at it from time to time. And if my 12 would only have 93% left I would care for it too (12 Mini from February but November manufactured still at 100% with 5W charging). We are not talking about 2% in 6 months but in some weeks, over and over. I don't get this negative reaction here. If it would happen to you, you would also be concerned. To me that doesn't sound normal. And of course it is an estimate but then why even show this number?

There are apps for Windows and Mac computers, I use Coconut Battery on my Mac, but there are Windows apps too, to show the exact battery capacity left. Maybe you should check there. There is another thread with the same iPhone 12 series problems, most with those problems use Magsafe. Nothing specific there f.e. with fast charging, only Magsafe usage mostly. So maybe it is a reason why it is dropping so quickly. But better check again on a PC/Mac app just to be sure.

And just to be sure maybe really do a full reset through iTunes Restore and start from scratch with a backup. Snd then check again.
 
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