A dead console will apparently take three hours to charge, four hours to deplete, then you don't touch it for thirty minutes.
Beside this, how do you know if your switch is charging?
When the AC adapter is first plugged into the console, the LCD screen will power on and the battery charging indicator will be displayed on the upper-right corner of the screen.
Subsequently, question is, can you play Nintendo switch while charging?
The Nintendo Switch's portability sets it apart from all other home consoles. However, charging your Switch back to full power only takes about three and a half hours. And you can always keep playing while the console is connected to power.
How long does it take to charge a Nintendo switch light?
Should I let my switch battery die?
The unit should not be left uncharged for long periods of time. Leaving it uncharged for long periods (months) may shorten the battery life. As with all batteries, the charge will slowly dissipate if not re-charged, even if it's not turned on.