Introduction
This guide will demonstrate how to replace the Battery Case inside the Wii Balance Board.
Tools
Parts
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            Flip device upside-down so the plastic white board is facing the ground. 
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            Locate the four feet in the corners of the Balance Board. 
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            Unscrew the three 12.7 mm Phillips screws from each foot cover. 
 
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            Locate the gray battery compartment. 
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            Push the tab on the bottom and lift up completely to remove the cover to the batteries. 
 
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To reassemble your device, follow these instructions in reverse order.
14 comments
I unscrewed everything, but were do i find a replacement battery compartent?
Olivia C -
Then what do you do after you remove the battery case?
Is there a way to open the top of the board by sliding or lifting the top? I bought a gently used wii fit. The lady who sold it to me very quickly opened the top of the board from the centre seam to show me the instruction manual and I think hook up cables. I cannot, for the life of me figure out how she did it! Any ideas or technical wizardry you can share?
Frustrated in Canada!