As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 4118 WAS CLIMBING THROUGH FL180 AND THE CREW RECEIVED A NR 1 BATTERY FAIL LIGHT ON THE RED WARNING PANEL. THE CREW CONSULTED THE QUICK REFERENCE HANDBOOK AND RETURNED BACK TO CAK. MAINTENANCE INSPECTED AND REPLACED THE BATTERY TEMPERATURE SENSOR IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 24-32-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.