Grab both halves of the battery by the upper corners and remove them from the frame.

Be careful not to twist or pull the cable connecting the halves of the battery.

Clean any remaining adhesive with a few drops of isopropyl alcohol and a lint-free cloth.

Don't reuse your old battery. A damaged or deformed battery is a safety hazard.

During reassembly, apply double-sided tape such as Tesa tape under the new battery.