You need to make sure the USB-C charging device is a USB-PD (Power Delivery) charger and not just a mobile phone Qualcomm Quickcharger power adapter. It won’t charge over the more typical 5V or 9V. Also, when charging the tablet using the Ravpower USD-PD powerbank, try shutting down the Cube Mix Plus first before charging. It would not charge if I plug in the powerbank while the tablet is turned on. The power light will just flicker on and off for a second but will charge even when I turned on if I do this. P.S The Cube Mix Plus will charge using 20V when I measured the power draw of the device using a USB-PD power meter.
Hey just an observation, I was also unable to get the Cube to charge using the Ravpower USB-PD battery pack directly. But strangely i had one of these laying around (https://www.apple.com/shop/product/MJ1K2AM/A/usb-c-digital-av-multiport-adapter?afid=p238%7Cs3kpSGqXc-dc_mtid_1870765e38482_pcrid_246386725857_&cid=aos-us-kwgo-pla-btb–slid–product-MJ1K2AM/A).
So if I plugged the Ravpower to the adapter, then the adapter to the Cube and its charging! Im not sure why it wont work directly, but maybe someone here knows why.
