Battery health problem of iphone 12 pro

Your battery is fine.

All batteries degrade. Inevitably. Inexorably. Always.

Review and follow this info: Batteries - Maximizing Performance - Apple

Background on battery tech: iPhone Battery and Performance - Apple Support

When the battery goes from good (80% and up, and yours here is fine) to not good (below 80%), you can consider a battery replacement.

Otherwise, use your iPhone for what you bought it for. Which was probably not as a digital estimate of an analog battery.

Your Battery capacity will decrease over time. It depends on how many times it has been charged. If it drops below 80%, I would think about replacing it. However, at the moment i do not feel that your battery health is concerning.

iPhone Battery and Performance - Apple Support

Yes it is normal in my point of view. I purchased my iPhone 12 Pro Max in December of 2020 as well. My battery health is at 89% and the other iPhone 12 Pro Max in the family, purchased at the same time, is at 90%. It is completely normal.

iPhone or any other phone's battery is a consumable product. It will degrade as time elapses. Apple recommends to have the battery replace when battery health reaches 80% or lower. That should be at about 2 years time.

I have learned to enjoy the $1300 iPhone and not worry at all about a $70 battery which I can replace after two years.

Axel F.