As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATTERY DISCHARGE LIGHT CAME ON, RAN THE QRH CHECK LIST BATTERY INDICATOR SHOWED A NEGATIVE DISCHARGE OF 5. DIVERSION TIME 52 MINUTES. REPLACED BOTH MAIN AND AUX BATTERIES REF AMM 24 31 11 000 802 002. OP TEST GOOD REF AMM 24 31 11 400 802 002. REPLACED MAIN BATTERY CHARGER REF AMM 24 31 21 000 802 002. OPS NORMAL REF 24 31 21 400 802 002. ACCOMPLISHED OPS TEST OF THE DC SYSTEM REF AMM 21 31 00 700 801. SYSTEM OPS NORMAL.