As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATTERY CHARGER CAUGHT ON FIRE AND POPPED C/B. INSTALLED NEW R2-56 RELAY NEW TEMP SENSORS, REINSTALLED BATTERY TRAY. INSTALLED NEW BATTERY CHARGER. REMOVED AND INSTALLED NEW BATTERY CHARGER C/B. BATTERIES LT S/N OFF 1030768 ON 10503139. RT S/N OFF 10503142 ON 10403938 DAL P/ 249701544.