iPhone battery health dropped

Batteries degrade over time with usage due to chemical aging, that's just how they work.

You can expect about a 1% drop per month with average use on an iPhone.

Apple recommends replacing it when it reaches 80%. To check your battery health, go to Settings > Battery > Battery Health.

iPhone Battery Replacement.

iPhone Battery Repair & Replacement - Apple Support

About Lithium Ion Batteries

iPhone Battery and Performance - Apple Support (IN)

Here are some tips on maximizing battery life.

Batteries - Maximizing Performance - Apple

Hi! Nope. It's completely normal for iPhone's battery health to depreciate over time. Once the battery health is less than 80%, that's when you should consider getting the battery replaced.

I hope this helps!

Lucky you. The battery should be at about 95-96% by now.