So I picked up a multimetre to test over the weekend. I've made some observations: The gpio pins are working perfectly: When the Pi and safe shutdown are both on. Both on and off pins read ~3.3v. Switching off the Safe Shutdown cuts the output for the "On" pin. The script detects this and initiates ...

@Camble No, unfortunately. I've got a powerboost in my GBZ build, but it's pretty well glued in and inaccessible.

FWIW, I tested manually switching the keepalive pin and still nothing. I also noticed the pi will power on when I connect the battery, regardless of the switch position. Is that normal?

Hey Camble, I purchased one of these a while back and only just got around to adding it to my build. I've paired it with Helders Retro PSU, which uses EN pin the same as PowerBoost 1000/c. Everything is wired up as directed in the diagram from the first post, with the exception of the LBO, which doe...