As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PRE-FLIGHT, EMER LIGHTS SET TO ARM & NOTHING HAPPENS. CHARGING BATTERY RESOLVED MOMENTARILY BUT THIS HAS HAPPENED 2 DAYS IN A ROW. BATTERY NOT HOLDING CHARGE. CORRECTIVE ACTON: REMOVED AND REPLACED ALL 4 EMERGENCY LIGHT BATTERY PACKS IN REFERENCE TO CE-680A MM 33-50-06. OPS CHECK GOOD.