As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE, THE CREW RECEIVED A BATTERY OVERHEAT INDICATION AND DIVERTED TO PIT. MAINTENANCE INSPECTED AND REPLACED THE NUMBER 2 MAIN BATTERY IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 24-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.