Grab the bottom left pull-tab with your fingers and pull it away from the battery, toward the bottom of the iPhone.

Follow the same procedure as with the previous strip: don't press down on the battery, keep the strip flat and unwrinkled, and pull at a low angle.

If the adhesive strip breaks off, try to retrieve it using your fingers or blunt tweezers, and continue pulling—but do not pry under the battery.

If the adhesive breaks off underneath the battery and can't be retrieved, continue with the next step.