Got the measurement of the Anker A9215 (Anker Nano international Travel Charger):
19.1 W / 11.88 V
The charger has two USB-C outputs:
- USB-C1 Output: 5V⎓3A, 15W / 9V⎓2,22A, 20W / 12V⎓1,67A, 20W (20W Max.)
- USB-C2 Output: 5V⎓3A, 15W (15W Max.); 2-Port / 3-Port / 4-Port: 15W Max. (shared )
Charges only from USB-C1 (power charging led between the USB-C expansion slots lights up as well).
Mistakenly used USB-C2 yesterday and 15W is not enough to charge.
Edit: Also can confirm that 5V does not charge the laptop (5V⎓3A on USB-C2). When the laptop is running the power meter just reads 0W on USB-C2. When the laptop is turned off the power meter and charging led indicator of the laptop constantly switch on and off like described in this thread
Charging from USB-C1 with 12V is solid though. Pretty nice form factor compared to the huge blocks with more ports and 65W or more.