iPhone SE (2020) dies overnight with 80% battery

Hi There,

Recently my iPhone SE (2020) has been dying overnight even though when I go to bed its battery is at 80%. I have Bluetooth turned off and still it appears to die.

It has 83% maximum capacity according to Battery health.

Here's screenshots of the battery activity last night from 20:00 - 03:00.

It's weird that it says the camera was doing something (second screenshot at 22:00-23:00) even though I also have my phone set to lock its screen after 30 seconds. According to that screenshot the screen was on for 20m, and I was, but I don't remember using my camera!? Super weird. Nonetheless, of all the screenshots below that appears to be the only major activity.

Which doesn't explain massive battery drain between the other hours when there was no other activity documented.

It seems, based on that, there is no reason then for the battery to drain so quickly — within 4 hours / 22:00-03:00 — when the screen is off, bluetooth is off, and no major app activity, of any kind, is happening.