iPhone 13 mini drained from 60% to 2% overnight
Recently my iPhone 13 mini has been really sluggish (sometimes it takes a second or two to react to taps), and battery life has been straight up bad. I am at 94% of battery health as I speak, even though like a month ago it was at 98%. I have been noticing seemingly worsened battery life, but just thought that I was dreaming, until today's morning, when I woke up and was astonished to see 2% of battery charge despite going to bed when it was 60% or so. I have closed all apps, and I verified that in the morning.
Now take a look at what my battery stats for the night look like:
All of the intervals from this night show "Usage by app is not available for X AM - Y AM", probably because I have closed all the apps when I was going to bed.
As to updates: I am not sure if I have updated my iPhone recently. At least I haven't had any troubles with overnight draining 3 days ago.
Please, don't suggest "restart" or "turn off location services", because clearly it's not the problem and it won't help me. The problem is much more substantial here. Besides, I have already tried all the basic fixes.
Right now I am considering downgrading to iOS 15 to see if I still have the same problem, but that's more of a last resort option.
iPhone 13 mini, iOS 16