Phone kept cutting off at 20%.
The repair went bad at first. I got the battery out and connected it back, but the right side of screen didn't work. Did some research and someone described the monitor cable clip as legos. Tried again and felt them all snap into place on both sides of each cable and the phone works perfectly.
Monitor cables are tricky. Make sure to feel it snapping into place when putting it back. No need to panic if it doesn't work at first—just try again. I did it like 10 times. I even bought a new iPhone on the 5th try when I gave up, lol. Eventually I tried again and it worked and I was able to cancel my order.