I have a 12 Pro Max purchased at release, battery is now at 83% capacity. Still lasts all day and then some, rarely think how much I've got left on a charge.

I set up a shortcut to put me into low-battery mode once I hit 95%. Works a treat.

I have the same phone, also lasts about a day and a half.

How do you see the capacity?

My three year old 15 Pro is already down to 85% capacity.

My 15 pro bought on release is at 91% and 607 cycles, for more reference.