As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE FLIGHT, BATTERY TEMP LIGHT ILLUMINATED. BATTERY SWITCH WAS TURNED OFF IAW EMERGENCY PROCEDURES. BATTERY HOT LIGHT ILLUMINATED A SHORT TIME AFTERWARDS. AIRCRAFT WAS LANDED A SHORT TIME AFTERWARDS AND MAINTENANCE NOTIFIED. REMOVED AND REPLACED AIRCRAFT BATTERY, REMOVED AND REPLACED BATTERY TEMP SENSOR, REMOVED AND REPLACED VOLTAGE REGULATOR. ALL PARTS INSTALLED WERE SERVICEABLE PARTS AND ALL WORK WAS IAW MM. (K)