The Razer Blade Stealth comes with a USB Power Delivery based charger that provides power into the notebook's USB Type-C port.
Using software from Granite River Labs, we are able to see how the Razer Blade Stealth's power adapter communicates with its computer.
The Razer Blade Stealth power adapter offers 5 volts @ 3 amps (15 watts), 12 volts @ 3 amps (36 watts), and 20 volts @ 2.25 amps (45 watts) power options to the Razer Blade Stealth.
The Razer Blade Stealth then selects the 20 volts @ 2.25 amps (45 watts) option.
Using an oscilloscope, we can confirm that the Razer Blade Stealth is drawing 19.7 volts @ .8 amps with the battery being well charged.