As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATTERY DISCHARGED, LIGHT ILLUMINATED AFTER ENGINES STARTED AND AC POWER ESTABLISHED SHOWING AN AMP METER DISCHARGE. ACFT GROUNDED. PERFORMED BATTERY INSTALLATION TEST REF MM 24-31-11 AND BATTERY CHARGER TEST IAW MM 24-31-21, OPS GOOD ALL INDICATIONS NORMAL.