NEW Repair box replacement battery cover for Nintendo Wii Balance board Q15 813048018421 | eBay
Amazon.com: RepairBox Battery Cover for Wii Fit Balance Board : Video Games
Fixing corroded battery contacts - EdVoncken.NET
Disassembling Wii Balance Board + Extra Bonus - YouTube
Corrosion from batteries that leaked on Wii Balance Board (more explanation in comment) : r/consolerepair
Wii Balance Board Front Cover Replacement - iFixit Repair Guide
Balance Board Disassembly - YouTube
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
Wii Balance Board Battery Case Replacement - iFixit Repair Guide