As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN BATTERY CHARGE OFF LIGHT ILLUMINATED. MX PANEL MAIN BATTERY VOLTS SHOWED 18 VOLTS THEN READ 29. HOWEVER, LIGHT REMAINED ILLUMINATED UNTIL DESCENT 10000 FEET. STRONG BURNING SMELL IN FLIGHT DECK. MX REPLACED MAIN BATTERY. OPERATIONS TEST MAIN BATTERY PROTECTION UNIT & FOUND TO BE OK.