Health battery

Battery Health & Performance 

Your battery health is fine and is undergoing normal usage. iPhone batteries, like all rechargeable batteries, are consumable components that become less effective as they age. You should change out the battery once your Battery Health reaches below 80% which will take over 2 years to reach under normal usage. Until then enjoy your iPhone.

Here is some more reading on an iPhone battery and its performance ➡️ iPhone Battery and Performance - Apple Support

Axel F.  

abdi1997 Said:

"Health battery: why iphone 13 pro max battery health dropping fast my health battery was 92 one week ago and now is 90"

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Battery Health:

Unfortunately, there is no way to determine why, nor when, the Battery Health drop occurred.

You don't know.....because the details are not provided......whether the battery was at 92.0% and dropped to 90.9%.....which is actually a drop of barely over 1%, but due to rounding, this will display as a drop of 92% to 90%.

So, it looks like a 2% drop when it was really only a tiny fraction over 1%.

The only really important number here is 80%. That is the point at which you need to replace the battery.....probably about 8-10 months from now.