Step 2: Unhooking the battery
Once the cover is off, the controller should look like this. Follow the red and black wire(s) from the battery to the connector.
Take a pair of small pliers and unhook the battery (refer to picture 2 of this step to see it unhooked).
The battery will simply lift out revealing the motherboard (refer to picture 3 ots).
From here, the plastic holding the battery will be able to lifted out.