Xs battery life increased?

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

hallu65 Said:

"Xs battery life increased?"

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About Battery Health Increasing:

All is Fine: The Battery Health can increase, not only decrease. So, what is occurring is normal, but not typical. No worries there. It's all just a gustation on Apple's part. Unfortunately, there is no way to know why, nor when, this percentage change occurred.