Removing the sticky strips: Take the head off a matchstick. Lift up the end of one sticky strip as per instructions. Hold the matchstick so that it’s parallel with the bottom edge of the battery and wrap the end of the sticky strip around the matchstick. Pull the matchstick+tape up/back a bit. Roll the matchstick to wrap more tape around it and pull up/back on the strip using your middle fingertip. Wrap, pull, wrap, pull, repeat until the end of the tape comes through.

Use a new matchstick for the second sticky strip.

It’s like how bakers roll a Swiss roll, in reverse.