Hi there!
I’m interested in creating a compact, battery-powered version of the wireless plasma kit, without using a powerbank. Can I just solder headers onto the board and use a LiPo SHIM to power everything? Or am I overlooking something major?
LiPos won’t provide 5V which you need for the LEDs. Now you might get away with less, but the idea of the plasma kit is to provide stable 5V and a level-shifter from 3V3 logic-level of the Pico to 5V for the data-line.
soldering headers to the plasma-kit will be a real challenge
The LiPo-shim is built for connecting from below, but below the Pico is the plasma-kit PCB
So all in all I would say this will never work. You could solder something directly to VBUS, but I don’t see any benefit compared to feeding power through the usb-plug.