The next three steps show how to apply new adhesive and install a new battery.

Use the flat end of your spudger to scrape an edge of the old adhesive into a ball large enough to grip with a pair of tweezers.

Use tweezers or your fingers to peel and remove the old adhesive from the frame.

If any residue remains, apply a few drops of highly-concentrated isopropyl alcohol (over 90%) to the frame and wipe it with a lint-free or microfiber cloth.