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Wii Fit : Rechargeable Battery Pack for Wii Fit™ Balance Board - SHOP01MEDIA - console accessories and mods, retro, shop - One Stop Shop!
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Amazon.com: Yunnyp 3800mAh Balance Board Battery,High Capacity Rechargeable Battery for Wii Fit : Video Games
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Corrosion from batteries that leaked on Wii Balance Board (more explanation in comment) : r/consolerepair
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