left 26650 in -10C (15F) by accident

Would it cause any damage to the battery, i forgot the light in the glove compartment and the temp has ranged from about 10ºC to –10ºC, its at 3.85V

Oh boy. Since it wasn’t purely out in the elements, it may well be fine. But I’d put it in a light a check it. Maybe run it a little and then charge it to see if it acts up.

It's fine. Let it warm up before using though.