As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTS ON START UP BATTERY VOLTAGE DROPPED BELOW MINIMUM REQUIRMENTS FOR PROPER START. UPON FURTHER INSPECTION FOUND MAIN SHIP BATTERY TO BE INOPERABLE. COMPLIED WITH REPLACMENT OF MAIN SHIP BATTERY. OPERATIONS CHECKED GOOD AND AIRCRAFT WAS OK FOR RETURN TO SERVICE.