The battery is still held in place with two stretch-release adhesive strips, similar to ones found in an iPhone.

Use your fingers to pry up the clear plastic pull-tab for one of the stretch release adhesives.

Grasp the pull-tab and slowly pull away from the battery at a shallow angle. The adhesive strip will stretch to many times its length and slowly release from underneath the battery.

Repeat the procedure for the second strip on the opposite side of the battery.

Be careful not to bend the battery. Breaking the battery is dangerous.

Remove the battery with your hands.