I don't know what your Razer Blade Stealth consumes in operation, but charging is probably rather scarce, the Type-C output is only 15W (5V, 3A max).
The maximum the powerbank can deliver is 18W (12V, 1.5A; 9V, 2A) from the Quick Charge 3.0 output, but then your device must also support Quick Charge 3.0.