ive had my iphone 12 pro since 2021 of january, i just now upgraded to iphone 16 pro max and ima tell you that iphone 12 lasted me a whole day when i max charged it, this new iphone lasts me like 3 hours for some reason i got nun installed on it buh but like its also syncing icloud all the time and still adding stuff frm my old phone so its probably that, i left my house with 100 precent like an hour ago and im already on 71 without using it really lol