What was found
ENROUTE LVL 1 BAT DISCHARGING ALERT. ALERT CAME ON MOMENTARILY SEVERAL TIMES AND THEN ALERT WAS CONTINUOUSLY ON AND OCCASIONALLY OFF REMAINDER OF FLIGHT. DECLARED EMERGENCY AND DIVERTED TO KORD. REMOVED AND REPLACED EPCU AS PRECAUTION PER AMM REF 24-08-01-4, ALL TESTS PASSED. ACCOMPLISHED APU RUN FOR 10 MINUTES AND THEN ENG RUN PER JRH FOR 35 MINUTES WITH FULL ELECTRICAL LOAD, NO BATTERY DISCHARGE FAULTS FOUND. NOTIFIED MOC AND ENGINEERING. OK FOR SERVICE.