For what it is worth, I just updated my iphone XR from IOS 17.7.2 to 18.3 and regret it, not only due to the horrid Photos app, but relevant here, Battery drain is significantly increased. Up through IOS 17.7.2, battery drain was never more than 2-4% per-day. I don't use the phone much other than to check a message or transfer a file or photo from the PC to the phone or vice-versa using Files over smb. After update to 18.3, battery drain jumped to 13-15% per-day with the same average use. That is a 3-5 fold increase in battery drain. I've disabled the privacy invading scan my photos for landmarks, and since this phone isn't AI capable, the AI nonsense shouldn't be causing additional battery drain -- but something is -- and it is significant. Take this as another data-point on the 18.3 battery-drain issue. There really is no reason I should see increased battery-drain on an XR, but it is significant. The only other issue that may be related to the drain is I've noticed touch-sensitivity is wildly high. For example this causes the Weather app to launch the secondary pages (like "Conditions") when simply trying to scroll up/down. Touch-pressure sensitivity was never this bad in releases up though IOS 17. Not sure if that causes additional drain, but it is worth reporting. Let me know if you are interested in any other settings. Most everything (Siri, Dictation, Notifications, etc. are all disabled), so the phone should idle with minimal battery demand.