As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS IN CABIN BEGAN FLICKERING IN FLIGHT. AFTER LANDING, TROUBLESHOOTING REVEALED A FAILED EMERGENCY LIGHTS BATTERY. BATTERY ASSEMBLY WAS REPLACED WITH NEW AND NO FURTHER DEFECTS WERE NOTED. THIS REPORT SUBMITTED TO COMPLY WITH PART 135 OPERATOR'S GENERAL MAINTENANCE MANUAL REQUIREMENTS.