Warning! Battery temperature too low, your device will be shut down

[AlbertJP]

@corvuscorax

if the battery contact is loose, that could explain flaky readings, especially on a digital sensor. So some of the times the sensor reads out fine, but every once in a while, it doesn’t, and might read “zero”.

The sensor in the FP1 is analog. I don’t know for the FP2 and FP3.