IPhone 11]iOS 14.5 can re-calibrate the iPhone battery life status. If an abnormality is found, Apple can replace the battery for free | Apple products - Archyde
How to recalibrate iPhone 11 battery on iOS 14.5
Apple Will Recalibrate iPhone Batteries When You Upgrade to iOS 14.5
How to Recalibrate Battery on iPhone 11, iPhone 11 Pro, & iPhone 11 Pro Max | OSXDaily