I have a corroded battery in my Wii Fit board. Can this be fixed?
Depending on how bad the leak is, you may be able to clean it out with something such as an old toothbrush, let it dry out, then try new batteries to see if it still works.
all you can really do is try to clean out the corrosion as best you can and then try a fresh set of batteries. Just be careful and try no to touch the corrosion with your hands directly, as it is very hazardous.
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