Run battery diagnostic iphone 13 pro max
How do I run my own battery health diagnostic?
Question marked as
All that is really important is the age of your phone and the current Maximum Capacity of your battery.
Settings > Battery > Battery Health & Charging > Maximum Capacity
Can you provide that information?
Apple Support is able to run a remote diagnostic on the battery if necessary, but if the battery is performing normally, they may have no reason to do this.