Corrosion from batteries that leaked on Wii Balance Board (more explanation in comment) : r/consolerepair
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Amazon.com: Wii Rechargeable Battery Pak Designed for Wii Fit : Video Games
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Fixing corroded battery contacts - EdVoncken.NET
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Some Life Blog: Fixed! Wii Fit Balance Board Won't Sync
Nintendo Wii Fit Balance Board Rechargeable Battery
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Amazon.com: AECBUY 3800mAh High Capacity Rechargeable Battery Pack for Wii Fit Balance Board (Color : Parent) : Video Games
Wii Balance Board Battery Case Replacement - iFixit Repair Guide
Wii Balance Board - Wikipedia
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Nintendo Wii Fit Plus + DDR Exercise Combo #5 (Balance Board + Wii Fit Plus Game + Battery + Bag + Mat + Sleeve + DDR Hottest Party 3 Game + 2 x Original Konami Dance Pad)
