As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE EMERGENCY LIGHTS TEST, WHEN PLACING THE SWITCH TO EMER LIGHTS ARM, NO EMERGENCY LIGHTS ILLUMINATE. PRIOR DAY HAD TO CHARGE THE LIGHTS PER THE CHECKLISTS. CORRECTIVE ACTION; REPLACED FAULTY #1 EMER LIGHT BATTERY PACK !AW CE-680A AMM CH. 33-50-06. CHARGED BATTERY FOR 2 HOURS, PERFORMED OPERATIONAL CHECK IAW CE-680A AMM CH. 33-50-00, OPS CHECK GOOD. CHARGED BATTERIES ONCE AGAIN FOR 2 HOURS POST OPS CHECK. NO FURTHER ACTION REQUIRED.