Use a heat gun and heat up the front side of the display to loosen the adhesive holding the battery in place.

Insert a thin, flat, flexible tool to release the adhesive between the battery and frame. Work along the side of the battery and eventually it will start to come loose.

Extreme caution is advised when working with batteries. A punctured battery is a fire hazard - don't use one. Dispose of it at your nearest battery recycling centre.

Once one side is free, you can do the same on the other side and should be able to life the battery up and out.