What was found
WE ENTERED THE PLANE AND WERE TESTING THE EMERGENCY LIGHTS AND FOUND SOME INOP. EMERGENCY LIGHT OVERHEAD SEAT NR 7, FLOOR LIGHTING SEAT NR 8, & EMERGENCY EXIT OVER A WING ARE NOT ILLUMINATING. CHARGED THE BATTERY FOR 60 MINS & STILL NO LIGHTS. VERIFIED DISCREPANCY. RESEARCHED AMM FOR LIGHT LOCATION THAT'S TIED TO THE BATTERY. FOUND THAT NR 3 BATTERY PACK LOCATION AFFECTS ALL THE LIGHTS AS DESCRIBED PER DISCREPANCY. REMOVED EMERGENCY BATTERY DUE TO BATTERY NOT HOLDING A CHARGE AND INSTALLED A NEW EMERGENCY BATTERY. ALLOWED BATTERIES TO CHARGE FOR 2 HRS. PERFORMED OPS CHECKS. OPS CHECKS SATISFACTORY. WORK PERFORMED IAW AMM 33-50-06.