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The travel-friendly Anker PowerCore+ 26800mAh PD with 27W PD Portable Charger Bundle can be used to charge various USB Type-C devices supporting USB Power Delivery including the Nintendo Switch Console.

To observe the USB Power Delivery communications between the Anker 30 watts based portable battery portion and Switch Console, we link up both devices over USB Type-C when the Switch's battery is fully drained. The Anker battery is initially seen to offer power profiles of 15 watts (5 volts @ 3 amps), and 30 watts (15 volts @ 2 amps) to the Nintendo Switch Console over USB Power Delivery.

The Nintendo Switch Console starts to request only 7.5 watts (15 volts @ 0.5 amps) from the Anker battery charger which it accepts.

We then observe Anker displays five different power profiles: 15 watts (5 volts @ 3 amps), 27 watts (9 volts @ 3 amps), 30 watts (12 volts @ 2.5  amps), 30 watts (15 volts @ 2 amps), and 25 watts (20 volts @ 1.25 amps) instead of only four as advertised on its casing. For some reason Anker didn't specify 30 watts (12 volts @ 2.5 amps) on its product label.

The Nintendo Switch Console still goes on to establish 7.5 watts (15 volts @ 0.5 amps) power contract with the Anker battery.

Here we can verify that the Switch Console from 0% battery only draws around 4.5 watts (15 volts @ 0.3 amps) from the Anker battery. Note the Console is just left alone being charged without the Joy-Con Controllers being attached or any active gameplay. This power is obviously much lower when compared to using the Switch's own charger in another review, which shows that the Switch can't charge quickly with the third party Anker PowerCore+ 26800mAh PD power bank using USB Power Delivery.