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Minor setback: these garbage PD trigger modules don't have diodes on the output, so the MCU that does PD negotiation gets/remains powered by the battery, then fails to realize it needs to do a PD handshake but feeds 13.5V back into the USB supply before negotiation. 🤬

Tomorrow I'll splice a power diode inline. 14.3V input is probably better anyway. And I have to wait for a new spool of filament to dry anyway to make the PCB side housing.

Otherwise it's working, and charged my phone like 15% while I was typing this.