Introduction
Disassembling the case requires removing screws under the batteries. Removing anything inside requires this guide.
Tools
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            Flip the Wii Remote over so the battery cover faces you. 
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            Push up on the bottom tab. 
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            Remove the battery cover. 
 
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            Remove the first battery by pressing down on the positive end and pulling the battery out. 
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            Remove the second battery by pushing up on the positive end and pulling the battery out. 
 
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            Using a tri-point Y1 Screwdriver, remove the two center 7mm screws by turning them counterclockwise. 
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            Repeat with the two bottom screws. 
 
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            With the flat end of a spudger, gently apply pressure to the tabs located on left side of the controller. 
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            Open the front plate like a book. 
 
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To reassemble your device, follow these instructions in reverse order.
4 comments
Worked! Had to solder the tab to contact the battery which had broken. Saved $50.00.
The Tools section lists a Tri-Point Y1 Screwdriver but the guide mentions a Tri-Wing Y1 Screwdriver. This could cause people to purchase the wrong item.
iFixit’s guides seem to be based on the original Wii controller, model RVL-003. I’m not sure if Nintendo has changed fasteners for subsequent versions but the Wii MotionPlus Controller, model RVL-036, uses a Tri-Wing Y0 screw.
kivrin -
My controller (the original) had three tri-wing screws and one philips. Not sure why. Had to re-solder the negative battery terminal as it came off the bottom of the ‘top’ (faces bottom) of the board.
audvare -