Old battery swollen and was popping up the display on the side with the volume control buttons
OK, took about 1 hr and 20 min. Followed your video step by step.
On your video it shows removing three cable connectors at top of phone. There are actually four. Went nuts trying to decide whether the fourth was a cable connector or some permanent attachment of some kind. Didn't want to damage the phone. Finally checked another U tube video and saw that there were four connectors that needed to be unplugged. Surprised that no one pointed this out to you before. Also, would have like some advice on how to handle the adhesive strips. I messed up two of them just removing them from the packaging then didn't know whether they should be put on the back of the battery first or lay them down inside the case where the battery goes.