By supporting up to 22.5 watts USB Power Delivery charging over Type-C, the Anker PowerCore 13400mAh Nintendo Switch Edition PD Portable Charger can be used to charge not only the Nintendo Switch but also latest phones like the Google Pixel 3 XL. Here we can see how power flows from the Anker power bank to the Google phone when connected over USB Power Delivery.
When plugged in to the USB Type-C port of the Anker power bank, the Google Pixel 3 XL on a dead battery quickly pulls current at 5 volts rail startup voltage to initiate charging to about 8.3 watts (5.2 volts @ 1.6 amps). This briefly followed by a quick drop of current near to zero but after a hard reset both the voltage and current ramp up resulting in about 17 watts (9 volts @ 1.9 amps) charging. The current then goes down a bit but continues to increase steadily from about 1.7-1.9 amps. At some points the phone can be seen to max out charging by pulling close to 2 amps to draw around 18 watts (9 volts @ 2 amps) from the power bank. Click here to download the trace captured by the GRL-A1 power analyzer to see more details.
The Google Pixel 3 XL works well with the Anker PowerCore 13400mAh Nintendo Switch Edition PD Portable Charger to get almost similar charging as with its own supplied 18 watts Google charger from this review.