Nothing looks out of place from what I can see (other than those super sketchy 18650s*). Your Pi is in the right orientation, battery board connectors look good, and you already tried 100% of the most common troubleshooting steps.
Best thing I can recommend is to check your voltages on the Pi with a multimeter if you can to see if it is getting any power when you try to power it on. Otherwise try flashing the OS to your known working flash card again using a different tool (Balena Etcher, Rufus, RaspberryPi Media Writer, DD, etc).
For my comment above about your batteries, the GTF (or more rarely GTP) branded 9900MAh batteries like yours I have tested usually only hold about 850-1200MAh. Trying your uConsole with another set of 18650s might not be a bad idea in case these ones cant handle the draw, but these sketchy cells do usually work so i kinda doubt this is your issue.
If nothing else works, email ClockWork. Their customer service is pretty great. They quickly sent me a replacement mobo for my GameShell when it was DOA with very few questions asked.
Adding an image of my uConsole just in case someone else notices something different.
