GTrusted

Third party chargers like the Targus 45W USB Type-C Laptop AC Wall Charger (click here for Amazon pricing) will definitely come in handy if the Qualcomm Quick Charge 3.0 charger that came with the HTC 10 phone isn't available. Let's observe how the Targus charger supplies power to the HTC 10 using USB Power Delivery with the phone's battery at 42% full.

The USB Power Delivery negotiations show the Targus 45W USB Type-C Laptop AC Wall Charger promising to deliver 15 watts (5 volts @ 3 amps), 36 watts (12 volts @ 3 amps), and 37.5 watts (15 volts @ 2.5 amps).

The HTC 10 then requests to pull 15 watts (5 volts @ 3 amps) from the charger which it accepts.

Several hard resets later, the Targus 45W USB Type-C Laptop AC Wall Charger advertises not only 15 watts (5 volts @ 3 amps), 36 watts (12 volts @ 3 amps), and 37.5 watts (15 volts @ 2.5 amps) it initially offered but also an additional power profile of 45 watts (20 volts @ 2.25 amps). The HTC 10 meanwhile still pulls 15 watts (5 volts @ 3 amps) from the charger.

While the Targus charger powers the HTC 10 from a 42% charged battery, the first 40 seconds sees no current being drawn, after which the phone only starts charging at 15 watts (5 volts @ 3 amps). 

Note that it took over 40 seconds for the charger to finally charge the phone given the constant hard resets.