Pull up the green adhesive strip to lift the battery out of its recess.

Although this kind of adhesive tab is supposed to make the battery removal easier, it may require some force. In case you're having trouble removing the battery, you can apply a heated iOpener to the center of the display, to loosen the adhesive underneath.

Swing the battery up to an upright position.

Peel the battery off the remaining adhesive.

Remove the battery.

During re-assembly, temporarily re-connect the battery to the motherboard to help align it correctly. Disconnect the battery after it is seated.