Corrosion from batteries that leaked on Wii Balance Board (more explanation in comment) : r/consolerepair
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Wii Balance Board Battery Case Replacement - iFixit Repair Guide
Accidentally left the batteries in my wii balance board for 9 years and it corroded the converters away, is it possible for me to fix? : r/consolerepair
Nintendo Wii Fit Balance Board Rechargeable Battery
How to Sync a Wii Fit Balance Board: 6 Steps (with Pictures)