As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE CREW RECEIVED A NUMBER 1 BATTERY OVERHEAT CAS MESSAGE AND RETURNED TO THE FIELD. MAINTENANCE INSPECTED AND REPLACED THE MAIN BATTERY IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 24-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.