Use this guide to replace the outer case on your Nintendo Wii U GamePad.
Face the GamePad down and unscrew the two Phillips #00 screws which are attached to the battery cover.
Lift up and remove the battery cover.
With your finger on the battery connector, pull downwards toward the base of the GamePad to disconnect it.
Pull upwards from the bottom of the battery to release it.
Remove the ten 8.9mm Tri-wing Y1 screws hidden underneath square stickers.
Lift up the back plate.
Unplug the connector that connects the back plate to the motherboard.
Remove the back plate.