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The Switch 2 has a mode that caps battery charge at 90 percent
The Nintendo Switch 2 will include an optional battery preservation mode that caps charging at 90 percent. This is to prolong battery life.
This will cap the console's charge as it approaches 90 percent and then maintain it at that amount. So the feature will let users sacrifice 10 percent of playtime for ongoing battery maintenance. When you unbox that shiny, new Switch 2, just head into system settings and look for a toggle that reads "Stop Charging Around 90%."
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