My battery stopped taking a charge, both wirelessly and through the USB-C port. It started by staying at 50% state of charge, regardless of how long or how little it charged. Then, I would get a question mark in the middle of the battery. Google reports showed this being a common problem among Pixel 4XL owners. I figured I'd try replacing the battery, it was worth a shot. The phone was out of warranty anyway.
The repair went smoothly. The iOpener worked flawlessly and I was able to sneak the opening picks under and cut the glue.
The most difficult portion of the entire process was cleaning the old glue off the phone. That's where a hair dryer or more heat helps.