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.
Seeing as the Joy-Cons can detach from the console, you may run out of battery at some point, and if you have run out of juice, we have how to charge Nintendo Switch 2 controllers explained so you can ...
To update your Nintendo Switch controllers, you'll need to head to the System Settings menu's "Controllers and Sensors" ...