Unplug the battery.
DO NOT USE ANYTHING METAL.
Use a credit card or a plastic pry tool.
Pry the back cover off along the seam on the edge.
Set the back cover aside.
Next you will need about 15 inches (38 centimeters) of dental floss.
(I used dental floss tape)
Start at a corner and slowly work the floss back and forth.
When the floss is about an inch (2.5 cm) under the battery.
Go to each corner and do the same.
Back to the first corner.
Work the dental floss under the battery.
Now take the remainder of floss to the opposit corner.
Be sure the floss is down at the bottom along the battery.
Work the floss under the corner and gently pull until all the floss is under the battery.
Do the above around the battery at each corner until the dental floss has passed through the entire underside of the battery.
place the credit card or plastic pry tool under battery to lift it out.