Batt Temp Light
Manual states (if in 206) to turn off the battery, test the warning lights if the Batt Hot light is unservicable then treat as though it were a Batt Hot situation - land and evacuate the aircraft. If the Batt Hot light is servicable continue the flight. Remembering you only have 30 ish minutes of battery life.
If the Bat Temp caption extinguishes, and after the battery is reselected, the caption re-illuminates, then switch the battery off and leave it off. With the Battery off failure of the generator will result in a total electrical failure.
Thermal runaway is very serious and can result in the battery exploding - always treat these cautions as serious.
recuperator - I have PM'd you.