As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PREFLIGHT, FOUND THE BAT CHARGING CAPTION ON AFTER 30 MINUTES, LIGHT REMAINED ON. FOUND LEFT BATTERY QUICK DISCONNECT TERMINALS BADLY BURNED AND DISCONNECT ALSO BURNED. REPLACED LEFT BATTERY AND REPLACED QUICK DISCONNECT. OPS CHECKS NORMAL