Don't reuse the battery after it's been removed, as doing so is a potential safety hazard. Replace it with a new battery.

To install a replacement battery:

Remove the old adhesive from the midframe by rolling chunks up with your fingers and peeling them off.

Dampen a microfiber or lint-free cloth with a few drops of isopropyl alcohol (over 90%) and wipe the midframe clean. Don't let any liquid drip through the circular cutouts in the battery recess.

Remove the protective liner from one side of each replacement adhesive strip. Apply each strip to the battery, using the old battery as reference for where it should go.

Press the new battery firmly into place.