As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW/ACT - ON APPROACH, NR 2 BATTERY OVERTEMP LIGHT STARTED GOING ON AND OFF. THE CAPTAIN DECLARED AN EMERGENCY AND LANDED WITHOUT FURTHER INCIDENT. THE BATTERY TEMP SENSOR WAS FOUND CORRODED. THE TEMP SENSOR WAS CHANGED AND AIRCRAFT RETURNED TO SERVICE. (X)