Potential Battery Failure

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I've had the Pinebook Pro for a few months now, and it's been perfectly fine until this afternoon. I was using it earlier this morning, plugged in with the barrel jack at 10% charge, to watch YouTube on the default OS. I left it to charge for a few hours (again, with the barrel jack) and when I came back the computer had zero charge. It will boot when plugged in, but of course shuts down when power is removed. I opened up the device and nothing appears out of the ordinary.