As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C WAS ENROUTE, ON A REPOSITIONING FLIGHT WHEN (BATT NR1 O TEMP) ILLUMINATED. DEVERTED, WHEN TEMPERATURE BEGAN TO RISE AN EMERGENCY WAS DECLARED AND THE AIRCRAFT LANDED UNEVENTFULLY. THE FIRE DEPT REPORT NORMAL BATT TEMP WAS INTICATED ON THEIR TESTING EQUIPMENT. REPLACED NR1 BATTERY IAW MM CHP 24-30-00. OPS CK GOOD.