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Xiaomi has given the Mi 6 its own Qualcomm Quick Charge 3.0 charger but since the phone also supports USB Power Delivery, it can be used with certain USB Power Delivery based chargers such as the Anker PowerCore+ 26800mAh PD with 27W PD Portable Charger Bundle. We look at what happens when charging the phone using the Anker portable AC charger accessory over USB Power Delivery through the GRL-USB-PD-A1 app by Granite River Labs.  

Note that the Mi 6 could possibly adopt Qualcomm Quick Charge 4+ technology for fast charging since the phone can use either USB Power Delivery or Qualcomm Quick Charge over the USB Type-C interface.  

When connected over USB Type-C, the Anker 27W PD Portable Charger is initially observed to consistently advertise USB Power Delivery source capabilities of 15 watts (5 volts @ 3 amps), 27 watts (9 volts @ 3 amps), and 45 watts (15 volts @ 3 amps). Meanwhile on its casing, Anker instead claims to support 15 watts (5 volts @ 3 amps), 27 watts (9 volts @ 3 amps), 30 watts (15 volts @ 2 amps), and 30 watts (20 volts @ 1.5 amps) power profiles. With the higher than specified 45 watts offering, this could present a potential danger of the AC adapter eventually overheating during charging.

With just 2% battery charge left, the Mi 6 at first selects the 15 watts (5 volts @ 3 amps) power option which the charger then agrees to provide.

After responding to the charger's Discover Identity request, the Mi 6 follows up to seal a higher 27 watts (9 volts @ 3 amps) power deal with the Anker charger.

While being charged from 2% battery and switched on, the Mi 6 briefly pulls current to reach around 3 amps starting at 5 volts after first requesting 15 watts power. The current pulled quickly drops down to about 1.5 amps @ 5 volts while the phone is active. During the 2nd power request of 27 watts, there's a sudden glitch in the current as the voltage goes up to around 9 volts. The power drawn eventually stabilizes to achieve around 15.3 watts (9 volts @ 1.7 amps) of charging.  

Note the Mi 6 was also seen getting the same 15.3 watts with the Apple 87W USB-C Power Adapter from this review, confirming that the phone works with the portable charger accessory of the Anker PowerCore+ 26800mAh PD with 27W PD Portable Charger Bundle.

Take care when using this charger with any notebook PC that tries to draw more than 30 watts. As observed from the above power delivery protocol negotiations, Anker actually advertises to offer 45 watts instead of the specified 30 watts that might cause the AC adapter to eventually overheat when supplying 45 watts which could create a potentially hazardous situation.