To sync a Nintendo Switch controller, you'll need to go into the "Change Grip/Order" menu on your console. There, you can add up to eight controllers.

To be honest, almost everything we've seen about the Switch 2 seems to imply that it will simply be the Switch, except more. A slightly larger screen, a more powerful SoC, and other incremental ...

You can charge a Nintendo Switch Joy-Con controller by attaching it to the console while it's connected to power, or through a charging grip.