Pry up with the plastic card to completely separate the battery's adhesive.

Remove the battery.

Use adhesive remover or isopropyl alcohol and a microfiber cloth to clean up any remaining adhesive left behind in the battery well before you install the new battery.

If your new battery does not come with pre-installed adhesive, follow this guide to install pre-cut adhesive on the bottom of 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.