What was found
DURING EMER LTS TEST THE WHITE EXIT SIGN ABOVE SEAT 7, RED EXIT SIGN BELOW LAVATORY SEAT, AND EVACUATION PATH LIGHTING BELOW LAVATORY SEAT DID NOT ILLUMINATE. FOLLOWED QRH AND CHARGED FOR 30 MINUTES AND RETESTED AND IT FAILED AGAIN. CHARGED FOR ADDITIONAL 30 MINUTES AND TEST FAILED AGAIN. REPLACED FAULTY EMERGENCY LIGHTING BATTERY PACK 4 IAW MM CH.33-50-06. POWERED AIRCRAFT AND PERFORMED EMERGENCY LIGHTING OPERATIONAL CHECK IAW CE680A MM CH.33-50-00 WITH NO DEFECTS NOTED.