What was found
DURING SVC, FOUND EMERGENCY PWR TEST COULD NOT BE COMPLETED. ONLY BATTERY VOLTAGE DROP TO 28V AND GO UP TO 31V WITHOUT BATTERY CHARGING ALERT. EPCU NO FAULT AND RTS TEST PASSED. BAT CHARGER C/B RESET NO HELP AND CYCLED A/C PWR NO HELP. STARTED APU PER JRH AND BAT VOLTAGE DROPPED TO 20V AND CHARGED TO 31V WITH BAT CHARGING ALERT. BUT EMER RWR TEST STILL SAME RESULT. PERFORMED FURTHER T/S IAW FIM 24-30-16-00. CK'D AND INSPECTED BAT EQIPMENT AREA AND BAT AMMETER SHUNT. FOUND NO DEFECT. INSPECTED CHARGER CONNECTOR PLUG AND NO DEFECT PER MM 24-34-03-4. PERFOMRED BAT CHARGER OPERATIONAL TEST PER MM 24-34-03-5, EMER PWR SW TURNED ON FOR 5 MINS AND TURNED OFF THEN BAT CHARGING ALERT IS SHOWN. FULLY CHARGED TO 33V. THEN PERFORMED EMER PWR TEST AND TEST COMPLETED NML WITH CHARGING ALERT AND PASS SEVERAL TIMES. NO HISTORY. A/C OK FOR SVC.