As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF RECEIVED LEVEL 2 BATTERY DISCHARGING ALERT REFERRED TO QRH RETURNED TO DEPARTURE. DURING DECENT ALERT WENT AWAY. SAME ALERT APPEARED ON FINAL FOR 15-30 SECONDS BUT WENT AWAY PRIOR TO TOUCHDOWN. R & R BOTH MAIN SHIPS BATTERIES. REF AMM 24-34-02-4. REPLACED MAIN BATTERY CHARGER. REF AMM 24-34-03-5. OPS CHECK ON BATTERIES AND BATTERY CHARGER GOOD.