Can confirm this.This was brought up in another thread, the battery in the iPhone 13 actually has more capacity then what is advertised. I looked at my battery using the CoconutBattery app on my Mac and it showed the max capacity to be 4472 mAh and its design (advertised) capacity to be 4352 mAh. This means that the battery in my phone is actually 102% when fully charged. This is part of the reason why when the phone is changed to 100% it takes a bit more time for it to drop to 99%. For me I am sticking to charging to 85% and not going lower than 20%.
My max capacity is 4402 mAh. Coconut Battery says 71% charged. iPhone battery indicator says 75%.