Battery drain IOS 14

I have an iPhone SE purchased in 2018. Just wanted to contribute another voice and story to the battery drain issue.

Every possible setting to reduce battery usage has been turned off since I purchased the phone, including using low power mode all the time. For sure, since 14.3 my phone has been consistently draining at night by at least 30% or 40% when during the day drains less than 10%.

I just updated to 14.4 yesterday at 7am, when phone was charged to 100%. I did not touch my phone all day and at 7pm, battery was at 97%. As an experiment, I even turned on airplane mode last night before falling asleep. I also turned off optimized battery changing yesterday, thinking that might be causing a problem. In the morning when I woke, the battery was at 68%.

I do not use my phone much at all, because I have an iPod and iPad. The only thing I use is the occasional phone call, message, email, safari when I am away from my other devices, and camera/photos app. I have a third party weather radar app that does not do anything when not in use (background app refresh is off for all apps) My battery health is fine at 100%. I was able to go three days at least without charging my phone until 14.3. There may have been slight diminishment after 14.2 but not enough for me to notice.

Everything was fine for three years, then for no reason at all, my battery is suddenly draining at night. It seems crazy that I need to charge my phone when it is in the 90% range at bedtime just to avoid an unexplained overnight battery drain!!

The other day I was called into work between 10pm and 1am, and while I was working in the hospital ER, I glanced at my phone a few times and sure enough for no reason, the battery drained around 30% during those hours while I was not using the phone at all except to briefly glance at the battery percentage two or three times.