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The BatPower PD6 has a Qualcomm Quick Charge based USB Type-A port to supply 15 watts of charging. We see how it can be used to power a USB Power Delivery enabled phone like the Google Pixel.

When we first connected the Google Pixel with the BatPower PD6 using a USB Type-A to Type-C cable, starting with a 13% battery the phone started off pulling an initial 7.5 watts (5 volts @ 1.5 amps) at power on. The current then went up to reach around 2 amps for charging to happen at 10.5 watts (5 volts @ 2.1 amps) in the first 15 seconds. The current then bounced up and down between 0.1 and 2.1 amps before the phone went back to drawing 10.5 watts (5 volts @ 2.1 amps).

Note no USB Power Delivery contract is established given that the USB Type-A connector generally doesn't support USB Power Delivery.  

While we only observed the Google Pixel pulling at most 10.5 watts of power, the phone is still able to charge with the BatPower PD6 despite the phone using USB Power Delivery and the BatPower PD6 uses Qualcomm Quick Charge 3.0 to charge the phone. However this 10.5 watts is still lower than when using USB Power Delivery to charge the Google Pixel as seen in this previous review. Nevertheless it's good to know that the phone can support other fast charging technology although it still gets the fastest charging through USB Power Delivery.