As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS COME ON IN ARM MODE AND THEN START BLINKING AFTER THE BATTERIES BLEED DOWN. REMOVED AND REPLACED THE NO. 1 & 2 EMERGENCY BATTEREIS IN ACCORDANCE WITH THE PHENOM 300 MAINTENANCE MANUAL 33-52-01. EMERGENCY BATTERIES WERE CUSTOMER SUPPLIED. PERFORMED OPERATIONAL CHECKS WITH NO DEFECTS FOUND AND CLOSED UP ACCESS.