Battery health capacity dropped - iPhone 11 Pro Max

[BR4DOKYBrazil]

My brother's iPhone (André's iPhone) dropped the battery life capacity by 2% with two months of use, and his wife's iPhone (Benelli's iPhone), purchased in the same week as his device, remains at 100%, according to the photos of Coconut.

We would like to know the reason for this.

Battery cycles are very close!

What is the reason?

 

[akash.nu]

Because battery capacity measurements aren’t hard science. It’s all estimations.