Remove the back casing by slowly popping each tab out with a plastic opening tool.
Carefully remove the tape one by one from the connecting wires with tweezers.
Carefully remove the black clips from both sides of the casing with a plastic opening tool.
The clips should pop off separate from the oval attachments.
Carefully remove the oval attachments from the casing.
Do not tug on the oval attachments because they are connected to fragile wires.
Carefully pull the oval attachments away from the back casing.
To remove the battery use a plastic spudger, or plastic opening tool to pry the battery apart from the sticky glue.
Do not bend the battery.
To completely disconnect the battery, locate the two metal tabs connected to the small circuit board.
Using a soldering tool, you will desolder the tabs from the circuit board.
Please refer to the How To Solder and Desolder Connections
If your replacement battery already has the small circuit board attached, you can desolder the red and black wires connected to the mother board instead of the metal tabs.
To insert the new battery, you will need to solder the two new metal tabs back onto the small circuit board.
Please refer to How To Solder and Desolder Connections
If you have the battery with the circuit board connected, then you can solder the red and black wires back to the mother board.