As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE NOTICED AN ODOR OF SMOKE, ON CHECKING FOUND BATTERY WAS THE CAUSE. BATTERY WAS TURNED OFF AND BATTTERY CHARGER CB PULLED. NO OTHER PROBLEMS NOTED. BATTERY VOLTAGE AND AMPS WERE NORMAL. UPON INSPECTION FOUND MAIN BATTERY SMOKING. REMOVED AND REPLACED AIRCRAFT MAIN BATTERY IAW B747 MM 24-31-01. OPS CHECKED GOOD IAW B747 MM 24-31-01.