What was found
EMER LIGHTS NOT WORKING IN ARMED POSITION FOR THE FIRST FLIGHT IN THE MORNING, IF YOU START THE APU AND CHARGE THEM FOR 30 MINUTES THEN THEY WORK. SAME THING HAPPENED THE FOLLOWING MORNING. THIS AFTERNOON WE SHUT DOWN THE AIRCRAFT FOR TWO HOURS AND THEY WOULD NOT HOLD A CHARGE FOR TWO HOURS. REMOVED AND REPLACED THE NR 1, 2, 3, AND 4 BATTERY PACKS IAW AMM 33-50-06, OPS CHECK GOOD.