As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GROUND POWER DROPPED OFF. ACFT BATTERIES DISCHARGED BELOW POINT TO WHERE GROUND POWER WILL CONNECT. ACFT GROUNDED. REMOVED ACFT MAIN BATTERY IAW AMM 24-31-11-000-400-802-002. INSTALLED A NEW MAIN BATTERY IAW AMM 24-31-11-400-802-002. PERFORMED BATTERY INSTALLATION TEST. TESTED GOOD.