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Nintendo's Japan twitter says to charge your battery every six months or the battery could die, and your was not charged for a year, it is highly likely that you may have to replace the battery.

"To recap some basic chemistry, batteries generate charge through an electrochemical reaction. While using the battery drains power quickly, batteries on standby still bleed power, albeit much more slowly. Left on their own for too long, batteries can lose the minimum charge required to kickstart their chemical reactions, meaning you’ll probably have to replace it. And replacing Switch batteries is a pain, even for tech-savvy gamers."

https://www.tomsguide.com/uk/news/nintendo-switch-charge-six-months



Wii/Mario Kart Wii Code:2793-0686-5434