Battery health dropped to 90% in less than a year

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.

priteshpatil13 Said:

"Battery health dropped to 90% in less than a year: I am using Iphone 13 from past 11 months. And its battery health is dropped to 90% . Even I am following all the instructions by apple to maintain battery health. What can I do to resolve this."

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Battery Health and New Battery:

All is Fine. From what you've reported, you are fine. Unfortunately, there is no way to know why, not when, the Battery Health decreased. Apple recommends you get a new battery when the Battery Health reaches 80% or lower.