Good instructions. Per iFixit, I am supposed to do "Battery Calibration" which consists of charging and keeping on charger for +2 hours, then using it until it dies, then recharging to 100%. Simple.

Apparently, I messed up the fingerprint sensor because it wouldn't work, but the phone was working great. Chaulk that up to learning experience. Was looking for a reason to upgrade anyway.

I set it up to play YouTube shorts, which loop until the phone dies. The phone dies while I'm asleep. I wake up. I plug it in. NOTHING. I flip the charger. NOTHING. I try a different charger. NOTHING. GREAT.

I swap back to my old battery in hopes I got a bad NEW battery. Get that all swapped and still nothing, but SOMETHING. It vibes when I plug it in but the screen is totally black. Try soft reset. Try reversing through all the steps to see if I forgot a cable or had one unseated. No problems at all.

Something happened to the SCREEN when the BATTERY DIED during recalibration. PROCEED WITH CAUTION