ha, if it’s just a thermistor then I might have a replacement in my 3D printer parts bags.
The fact it worked perfectly before the rain and even after I ran it for a bit in the rain and only failed a few days after having had to sit through heavy rains and the end at the batteries(sensor end) was wet I’m pretty sure it got moisture inside an is effecting its resistance.
I’ll dig around for what it’s valid resistance range is, make a measurement and see if something in my parts bins works.
I was going to zip-tie it to the metal battery post since that’s the best place to measure battery temp but like many things, I didn’t get to it in time.