What was found
EMERGENCY LIGHTING: 30 MINUTES INTO FLIGHT UPON LOOKING AFT INTO CABIN WE DISCOVERED THE EMERGENCY LIGHTS ILLUMINATED WITH THE SWITCH IN THE ARM POSITION. WE COULD NOT TURN THEM OFF. NO BREAKERS WERE POPPED . AFTER LANDING AND DE-POWER , WE APPLIED BATTERIES AND GPU. THE EMER LIGHTS WOULD ILLUMINATE IN THE ARM CONDITION. //SIGNOFF// TROUBLE SHOT AND FOUND THAT BOTH FWD AND AFT ERNER BATT'S ARE DEPLETED OF MOST OF THERE CHARGE, REMOVED AND REPLACED BOTH FWD AND AFT EMER BATT'S IAW EMB-505 AMM CH 33-52-01/400 OP'S CK GOOD.