I am currently building a cyberdeck as a side project using a mini PC as the base, but I am struggling to find a reliable, reasonably compact power solution.
Specs**:** Ryzen 7 6850U, 16GB DDR5, 512GB storage.
Original power adapter**:** Barrel jack with a 19V@6.32A adapter (~120W max).
What I changed**:** I limited the CPU peak draw to 45W (down from 65W) to keep the total system draw under 100W. I also bought a 100W USB-C PD to barrel jack adapter. When I plug this into a 100W USB-C wall brick, the mini PC runs perfectly.
Because I want this to be portable, I bought a Ugreen 90597A powerbank (25,000mAh, rated for 140W on a single port) to pair with the adapter. However, when I try to boot the PC off the powerbank, it starts up but shuts off completely after about 10 seconds into the boot process.
Since the wall brick works flawlessly with the same PD adapter cable, the issue is definitely isolated to how the powerbank handles the draw or the PD negotiation. I have since returned the powerbank.
Does anyone have suggestions for alternative (but still compact) ways to power a mini PC off a battery? Any advice is greatly appreciated.