Highly recommend pulling the adhesive strips straight out like in the video for "iPhone Battery Adhesive Strips Replacement," rather than trying to go around the corners. I went around the corner with the first strip, and it ended up breaking off and I couldn't get to it again. For the second strip, I just slowly and steadily pulled it straight out and it didn't break at all. My new battery works great! No more random shut offs at 80% charge.