As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS - AIRCRAFT WAS IN FOR A 4C INSPECTION AND DURING THE SERVICE ROUTINE, THE NR 1 EMERGENCY LIGHT BATTERY WAS FOUND NOT CHARGED. MAINTENANCE REPLACED THE EMERGENCY BATTERY AND THE OPS CHECK WAS GOOD. A/C WILL BE REL. UPON COMPLETION OF ALL WORK.