Portable charging options like the travel-friendly Energear 46W USB-C Wall Charger would come handy to supply power to supported devices when missing their own AC chargers. Besides USB Type-C enabled phones and tablets, the Energear charger can also be used to rapidly charge certain USB-C based notebook PC's such as the Lenovo Yoga 920 (2-in-1) up to 46 watts using USB Power Delivery. Let's see here how well the Yoga 920 (2-in-1) is able to draw power through one of its dual Thunderbolt 3 enabled USB Type-C ports when connected to the USB-certified Energear 46W USB-C Wall Charger.
Upon plugin using a USB Type-C to Type-C cable, we take a closer look at the USB Power Delivery protocol negotiations between Energear and the Yoga PC using the Granite River Labs GRL-USB-PD-A1 power analyzer software. At the beginning, Vendor Defined Messages can be seen trying to adjust initial voltage and current over multiple Discover ID requests while the Yoga 920 (2-in-1) is 5% charged. Once over, the Energear 46W USB-C Wall Charger starts to display supported power profiles of: 15 watts (5 volts @ 3 amps), 27 watts (9 volts @ 3 amps), 36 watts (12 volts @ 3 amps), 45 watts (15 volts @ 3 amps), and 46 watts (20 volts @ 2.3 amps) via USB Power Delivery.
The Yoga 920 (2-in-1) simply requests from Energear the highest 46 watts (20 volts @ 2.3 amps) charging which then gets accepted.
We next observe recurring Vendor Defined Messages that go on continuously to initiate Discover ID's in the protocol negotiation.
As seen below, the Energear 46W USB-C Wall Charger is able to provide around 44.4 watts (20.2 volts @ 2.2 amps) of stable power to successfully charge the Yoga 920 (2-in-1) from initial plugin while the PC is on at 5% battery level. Although the Yoga 920 (2-in-1) owns a higher output USB Power Delivery based Lenovo USB-C charger to enable faster charging up to 65W, you can still use the Energear charger to supply a decent amount of power to keep the PC charged when required.