Hi, I have a similar issue with GPi case 1, Raspberry zero 2, and recalbox 8.0. I tried with the image of another system, with the same batteries and SD it correctly boots. However when using recalbox 8.0, I can not start with batteries only. I have to boot with a power cable, and when it is fully loaded I can remove it and continue playing with batteries only.

When booting from batteries it continues to stop and reboot at the "Have fun" screen. I tried both with the secure shutdown switch on and off.

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