As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - AIRCRAFT WAS IN CRUISE AFTER DEPARTING, AND THE RIGHT BATTERY OVERHEAT CAME ON. RETURNED TO DFW AND LANDED WITHOUT FURTHER INCIDENT. FOUND RIGHT BATTERY SENSOR BAD. REPLACED RIGHT BATTERY SENSOR IAW MARATHON AND DORNIER MM. OPS CHECKED GOOD, AIRCRAFT RETURNED TO SERVICE.