What was found
EMER LIGHTS ON WITH SWITCH IN THE OFF POSITION. UPON ARRIVAL TO THE ACFT NOTED THAT THE EMERGENCY LIGHTS ON THE LT INSPECTION LIGHT, THE LIGHT ABOVE SEAT 7, AND THE EMERGENCY DOOR EXIT SIGN WERE STILL OUT. THEY WERE ALL FAIRLY BRIGHT BUT I WAS UNSURE OF HOW LONG THE LIGHTS WERE ON. GAINED ACCESS TO THE NR 3 EMERGENCY BATTERY. VERIFIED THAT THE CONNECTOR TO IT WAS FULLY SEATED. PUSHED THE INERTIA SWITCH AND ALL OF THE LIGHTS THAT WERE ON WENT OFF. DUE TO NOT KNOWING THE AMOUNT OF TIME THE LIGHTS WERE ON PERFORMED THE TWO HOUR CHARGING CALLED FOR IN THE EMERGENCY LIGHTING OPS CHKD. OPS CHECKED GOOD, ALL EMERGENCY LIGHTS TURN ON AND OFF WHEN SELECTED. ALL WORK DONE IAW AMM 33-50-00.