The tape tabs broke almost immediately upon pulling up just a little bit (less than in the video). My phone is over 2 years old, and maybe the plastic weakens over time. I used a hair dryer on the back of the phone to soften the adhesive and the green prying tool in the iFixit repair kit to pry up the edge of the battery along the side wall of the back case. It bent the battery, but it worked to (slowly) pry the battery out without damaging the phone.
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