Take note of the path the wires are place into from the battery to the terminal on the main board.

Use a spudger or finger nails to carefully pry out the battery connector (and wires) from the terminal on the main board. Once removed this will disconnect the wires connected to battery.

NOTE! There is a very fine wire which crosses over the battery and you must be careful to not break this wire, so the battery has to be lifted out from the top.

Working from the opposite end of the battery wires, carefully pry the battery off from its light adhesive.