Introduction
Tools
Parts
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Unscrew the four 6.5mm screws, using a Phillips-Head screwdriver.
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Pry the two halves of the shell apart using a plastic opening tool.
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Unplug the black and red wires from the power port located on the motherboard.
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Remove the old battery from the controller.
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Remove the 6.43mm screw connecting the motherboard to the inner workings of the controller, using a Phillips-Head screwdriver.
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Conclusion
To reassemble your device, follow these instructions in reverse order.
When re-asembling, be careful to check that all buttons/triggers are moving correctly. They can get misaligned when prying the two shell halves apart.
Tale Spinner -
This part is missing vital information on how to correctly pry the case open. In the 3rd picture you can see there is actually damaged/broken clip already. In order to open the case without damage to the plastic clips inside the controller holding the plastics together you need to insert thin piece of metal between the trigger buttons on each side and push the clip outwards before trying to separate the parts, and if done correctly there is no force needed to pry open the controller. There is actually no necessary need for the clips, but if you want to keep your controller in mint condition without voiding the warranty, take care not to break these clips.
Ville Närhi -
Your advice for opening shell was so bad and harmful.
It's not correct
Kiarash Moallemi -
And two more tiny clips to the left and right of the headphone & EXT port. They’re VERY delicate, reckless prying WILL break at least ONE of these.
Strings Cat -
I've written a guide for how to find and unlatch the clips
Important Step For Opening the DualShock 4 CUH-ZCT2U
Richard -