Tilt the iPad up and apply a few drops of isopropyl alcohol to the top left edge of the battery.

Keep the iPad tilted for a minute to let the alcohol penetrate the adhesive.

Insert the flat edge of an opening pick into the crevice above the top left edge of the battery.

Slowly press the pick under the battery to loosen the adhesive.

Slide the pick along the top left edge of the battery to loosen the adhesive.