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The Xiaomi Mi 5 supports Qualcomm Quick Charge 3.0 over USB Type-C and while we've seen various compatibility issues with USB Power Delivery chargers, let's see how well it works with other Qualcomm Quick Charge 3.0 chargers from LG G5 and HTC 10.

Note the oscilloscope screenshots below are taken while the Xiaomi Mi 5 battery is at about 80% full.

First, Xiaomi Mi 5 has the following voltage and current charging waveforms when charging with the LG G5's Qualcomm Quick Charge 3.0 based charger.  This charger claims supports 9 volts @ 1.8 amps and 5 volts @ 1.8 amps and we can see that the Xiaomi Mi 5 actually pulls 9.1 volts @ 1 amps from it.

Similarly, using the Xiaomi Mi 5 Qualcomm Quick Charge 3.0 Charger, we also see that the voltage reaches 9 volts while the current hits about 1 amp.  This charger claims 5 volts @ 2 amps, 9 volts @ 1.2 amps, and 12 volts @ 1 amps.

Interestingly you get the best performance with the HTC 10's Qualcomm Quick Charge 3.0 Charger where the voltage reaches 7.7 volts while the current hits 1.6 amps with the Xiaomi Mi 5.  The HTC 10 charger claims support of 5 volts @ 2.5 amps, 9 volts @ 1.7 amps, and 12 volts @ 1.25 amps so the actual voltage of 7.7 volts seen is less than the 9 volts amps stated by the charger.