As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SECOND OCCURRENCE, AFTER START ON RECALL BOTH BAT DISCHARGE AND ELEC LIGHT WERE ILLUMINATED. BEFORE FIRST CHECKLIST WAS COMPLETED BAT DISCHARGE LIGHT WENT OUT, BUT ELEC LIGHT STAYED ILLUMINATED. GROUNDED - YES. REMOVED AND REPLACED MAIN BATTERY CHARGER OPS CHECK GOOD REF AMM 24-31-21.