I'm testing this power bank by Miraku right now. It's a PD 12v 1.5a. Holds 10000mAh.

https://www.amazon.com/gp/product/B077ZQH8TQ

It is able to charge while in desktop use. I'm copying a 54GB game from my USB to the SSD and using Chrome, and the charge has gone up from 66% to around 70% in about 30 minutes. Backlight on 25% which is enough for me.

Once this file copy is done I'll see how it holds up while playing a game with decent graphics. I doubt it'll be able to charge while gaming, but it should slow down the battery drain.

I also have a car charger I'll be testing today. I'll comment separately with those results.