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How Well the Google Pixel 2 XL Phone Uses USB Power Delivery with Own Google 18W Charger

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To support USB Power Delivery based charging, the Google Pixel 2 XL phone is provided with its own Pixel 2 18W USB-C Power Adapter that can supply 15 watts (5 volts @ 3 amps) and 18 watts (9 volts @ 2 amps) to the phone. Let’s find out how much power the Google charger actually delivers to the Google Pixel 2 XL when connected directly using the USB Type-C to USB Type-C cable that came with the charger.

Using the GRL-USB-PD-A1 analyzer software from Granite River Labs, we can easily see how the Pixel 2 18W USB-C Power Adapter communicates with the Google Pixel 2 XL over USB Power Delivery protocol transactions. The Google charger initially declares 15 watts (5 volts @ 3 amps) and 18 watts (9 volts @ 2 amps) to offer the phone while at 7% charged.

The Google Pixel 2 XL goes on to request and establish the highest 18 watts (9 volts @ 2 amps) power contract for fastest charging with its own charger.

From the power graph, starting at 7% battery charge and switched on, the Google Pixel 2 XL is first observed to pull current below 1 amps at around 9.1 volts. When the phone is in sleep mode, it pulls higher current to achieve about 17.3 watts (9.1 volts @ 1.9 amps) briefly before the current goes down to almost 1.3 amps for power to be drawn lower at around 11.8 watts (9.1 volts @ 1.3 amps). While the phone is actively used, it pulls even lower current to charge at only about 6.4 watts (9.1 volts @ 0.7 amps). 

The Google Pixel 2 XL supports USB Power Delivery well to effectively charge with its own Pixel 2 18W USB-C Power Adapter although 18W of charging is only used for a brief amount of time. In fact, the phone can also achieve similar charging with other USB Power Delivery based chargers like the  Apple 87W USB-C Power Adapter (click here to see more).

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