Using a plastic opening tool, gently pry the edges battery off of the backside of the touchscreen display. Start at the end of the battery opposite the connecting wires.

Once the edges are free, slowly work inward with the opening tool until the battery is free. This may take some time, since copious amounts of adhesive were used to anchor the battery in place.

Be careful not to damage the wires connecting the battery to the circuit board or the touchscreen underneath the battery.