As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3857, BATTERY MASTER LEFT ON, DISPLAY ED1 SHOWING DISPLAY HI TEMP WARNING ON SCREEN. ELEC OVERHEAT ODOR IN COCKPIT. ALLOWED MAIN BATTERY TO CHARGE. PERFORMED MASTER BATTERY OPERATIONS CHECK IAW AMM 24-31-01. OPERATIONS CHECKED GOOD, NO ODOR NOTED IN COCKPIT AT THIS TIME.