My iPhone 13 mini drains battery like never before after upgrading to iOS 16, none of the smaller updates has fixed anything. Today while visiting grandparents, my iPhone 13 mini was in my coat pocket, not in use. After a couple of hours, ready to leave, I checked for messages and the like, and my phone was HOT, and down to 22% battery, coming from approx 90% when I unplugged from my car. My wifes iPhone SE 2nd gen. has the exact same issues. The battery section of the phone indicates no activity at the time, so what the hell is using up my battery? Never had such issues with any previous iOS. Frustrated!!!