Photon Hard Fault [RESOLVED]

My Photon is giving a hard fault when powering using anything but the USB. I've tried various voltages applied to the vin pin, but they all give me eithera faint glow on the led, or the hard fault code. The blue led on D7 is also faintly on. It works fine when running on the USB though. As a test, I flashed the "Blink an led" test code, and it still does it so I don't think it's software related.

Thanks for your help.

I just got 3 new batteries and tried it again, and it works! I probably should have tried that before asking the internet...

Hey, welcome to the community!
Just ask if you hit trouble again.

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