Hard reset killed my battery

[TyWahn]

Hey all
Just like the title says. My phone 14Pro was bugging out. When I’d launch an app, it would just be black. Happened when I swiped up and tried again.
I turned it off, then it kept doing it.
So I did a hard reset (holding power until Apple logo shows) and now my battery, which was AMAZING, now runs out before the day is out.
I used to go to bed with over 65% now I’m lucky to get more than 20%.
Anybody know why this happened ?
I had Apple run a diagnostic over the air and he said it looked fine and had no explanation.
I’m stumped and totally bummed.
Thanks for any help. Sorry for the long post.
Ty

 

[Chrisjmv]

Maybe something is still running in the background?

I would make an DFU mode reset and before that do backup it and set it up as a new phone without importing the backup and see if it still behaves like that.

And you can try it with the backup. Sometimes backups saves everything that can cause apps or other stuff causing a „loop“ that is running in the background and eating battery in no time like in your case.

Pleaser let me know if it worked!

 

[now i see it]

A forced restart normally doesn’t hurt anything.
At this point, you might as well try the old fashioned battery display calibration procedure that used to be valid for older phones. No harm trying.

Discharge the phone all the way down to the bottom, this tells the charging circuit where the bottom is. Then charge it all the way up to 100% + at least an hour. Don’t use the phone during charging. This tells the charger where to top is.
Then discharge it again all the way to the bottom. This lets the charger verify the bottom again- then charge it back up.

If this procedure doesn’t help (it used to help older iPhones) then maybe the only recourse is a wipe & reinstall.