Use your fingers to carefully pull the cable out of the socket.

Remove the battery.

Do not reuse the battery after it has been removed, as doing so is a potential safety hazard. Replace it with a new battery.

It is likely you can reuse the old adhesive with the new battery. If you wish to replace the adhesive instead, remove the old adhesive and wipe away any adhesive residue with a lint-free cloth and high-concentration isopropyl alcohol.

Follow this guide to install new precut adhesive.