Health battery dropping fast without reason

Hello, i am from Greece, i have an iphone 13 pro bought it exactly 1 year ago. For 8 months period my battery health was at 98% , and its been 1 month that almost every week drops 1% now is at 93%.

The charging scedule is the same like before ,i havent changed anything from my routine.

statistically 96% will be ok nothing less nothing more.

And my friends too, with the same phones and also the rumour for iphone 14 that the health drops fast.

Can you explain please these drop because is not normal?

Thank you.

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Health battery dropping fast without reason
 
 
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