As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATTERY OVERTEMP INDICATED R-RED CAS MESSAGE IN FLIGHT. FOUND SPLICE AT THE BATTERY TEMP SENSOR CONNECTOR PY044 BROKEN. ALSO CONNECTOR WAS FOUND BADLY CORRODED INSIDE OF CONNECTOR. REPLACED CONNECTOR PY044 AND REPLACED WIRES IAW CE750 WIRING MANUAL 20-10-06. THE INCIDENT WAS AN INDICATION PROBLEM ONLY AND BOTH AIRCRAFT BATTERIES WERE FOUND TO BE NORMAL (AIRWORTHY) WITH NO ACTION REQUIRED. (K)