How to Charge the Joy-Con Controllers
It takes approximately 3 ½ hours to fully charge the Joy-Con controllers.
The Joy-Con can be charged in the following ways:
While attached to the Nintendo Switch console.
Attach the Joy-Con to the Nintendo Switch console.
Charge the console.
While attached to the Joy-Con charging grip.
Attach the Joy-Con to the Joy-Con charging grip.
Connect the Joy-Con charging grip to the Nintendo Switch dock using the USB cable that was included in the box, or connect it directly to the Nintendo Switch AC adapter (HAC-002).