As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROX 30 MINUTES AFTER GROUND POWER HOOKED UP, SMOKE EXITING E/E EXHAUST. OPENED E/E DOOR AND SMOKE IN AREA. BATTERY BOX RED HOT. ALSO NOTE AIRCRAFT LOG 6. REPLACED MAIN BATTERY AND BATTERY CHARGER. BATTERY STILL IN PROCESS OF FULLY CHARGING. NEED TO VERIFY BATTERY IS FULLY CHARGED AFTER APPROX 75 MIN. BATTERY FULLY CHARGED.