As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATTERY WAS FOUND AT 6 VOLTS ON 3-11-98. BATTERY WAS CHARGED TO 22.5 VOLTS. WHILE DISCONNECTED FROM AIRCRAFT, VOLTAGE DROPPED FROM 22.5 VOLTS TO 18 VOLTS IN ONE HOUR. VOLTAGE WAS MEASURED AT 15.4 VOLTS AFTER 5 HOURS. AIRCRAFT BATTERY WAS INSTALLED NEW AT 4469:05 AIRCRAFT HOURS ON 1-30-98. REPLACED WITH SERVICEABLE AIRCRAFT BATTERY.