Disconnect the battery from the mainboard, using a plastic tool.

Using a heat gun, heat up the front of the display in the area of the battery.

Once the glue has been warmed up, use a thin spudger, preferably plastic, to pry the battery loose. It is best to try and pry it up from the frame side.

CAUTION: do not pry too hard or use anything sharp to try and remove the battery.