Battery
How to improve battery health. Is there a chance to increase capacity?
iPhone 11, iOS 14
No chance to increase capacity. You practice good habits to prolong battery health however it will always decrease as time elapses. 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.