Launch day iPhone 12 Pro Max, battery health is still at 97 % but I have definitely noticed a drop in battery life. I used to charge my iPhone AFTER waking up in the morning to 100 % and it would last me until the next morning with still around 40+ % left (I do use it a lot) but now I have to charge it in the evening already and then again during the day. I am so "anal" about it that I have already tried resetting all settings and keep checking what settings I may need to turn off but I do not know. This has happened to me on every iPhone I have ever owned for some reason. First impression is great but few months in and I am always checking settings. Maybe it is also an personal obsessive issue LOL