As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE EMERGENCY LIGHTS ILLUMINATED IN THE COCKPIT AND CABIN. SHORTLY AFTERWARDS THE EMERGENCY LIGHTS NOT ARMED MESSAGE APPEARED ON THE EICAS. REPLACED EMERGENCY BATTERIES NR 1 AND NR 3 IAW EMB 145 MM 33-50-04. BOTH BATTERIES HAD LOW VOLTAGE. PERFORMED EMERGENCY LIGHTING TEST IAW EMB-145 MM 33-50-00. NO DEFECTS NOTED. A/C RETURNED TO SERVICE. (M)