Make sure you pull out the strip in a slow and steady motion and in a flat angle. To prevent the adhesive strip from ripping, it is helpful to twist the strip around the tweezers.

In case one of the adhesive strips rips and it’s not possible to pull it out completely, you can use high isopropyl alcohol (>90%) and/or a heated iOpener to loosen the adhesive. After the adhesive is soft enough use a prying tool such as an opening pick, a plastic/playing card or a spudger to carefully pry out the battery.