Troubleshooting "battery absent" issue?

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I am experiencing an issue similar to the one described in this thread: my Framework 13 (running Fedora Linux) will only boot when connected to power; and, indeed, it boots immediately (without pressing the power button) when I plug it in, and shuts down hard when the power cable is removed.

The output of sudo dmesg | grep battery is

[    0.970254] ACPI: battery: Slot [BAT1] (battery absent)

Naturally, this “absent” description makes me suspect that the problem is either with the battery itself, or with the battery connector on the mainboard. The battery cable is plugged in securely, and I don’t think any of the pins are bent, but it might be too subtle for me to see.

Can anyone suggest diagnostic steps I might take to locate the problem more precisely, so that I don’t end up trying to repair or replace a part that isn’t broken?

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This could mean mainboard problem, some circuit or components maybe shorted. I physically removed the battery and connected to AC and it still booted after me pressing the power button. I suggest resetting the mainboard first

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If you have a spare battery plug that in. (or if you know someone with a framework, swap batteries temporarily). Depending on your budget a spare battery is 50$ + shipping - https://frame.work/products/battery?v=FRANBBAT01

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This was it! After resetting the mainboard, the machine now operates normally on battery power. Thank you!

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