What was found
DURING MX PRE-FLIGHT, FOUND THE R1 OVERHEAD EMERGENCY LIGHT, EMERGENCY LOCATOR SIGN, AND R1 OUTDOOR EMERGENCY LIGHT WAS OUT. FOUND EMERGENCY LIGHT BATTERY PACK, M730, DEAD. REMOVED BATTERY PACK AND TRIED TO CHARGE IN SHOP FOR 4 HOURS PRIOR TO FLIGHT. BATTERY PACK VOLTAGE ONLY WENT FROM 1 VOLT TO 1.5 VOLTS. BATTERY PACK NO LONGER VIABLE. REMOVED AND REPLACED EMERGENCY LIGHT BATTERY PACK M730 AS PER ABOVE REF. OPS CHECK GOOD. ACFT OK FOR SERVICE.