As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIOR TO DEPARTURE THE BATTERY DISCHARGE LIGHT ILLUMINATED DC AMPS 6 DC VOLTS 27. PERFORMED FIM TASK 24 31 00 810 801, NO FAULTS FOUND AND NO HISTORY IN THE PAST 90 DAYS. AS A PRECAUTION REPLACED MAIN BATTERY CHARGER AND BOTH MAIN BATTERIES.AS PER AMM 24 31 21 000 802 002 AND 24 31 11 000 802 002. PERFORMED MAIN BATTERY CHARGER TEST AS PER AMM 24 31 21 710 810 OPS NORMAL.