As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATTERY DISCHARGE LIGHT ON 10 AMPS ON MAIN BATTERY METER. COMPLETED MAIN BATTERY CHARGER OP TEST PER AMM 24-31-21-PB501. MAIN BATTERY & CHARGER OP CHECKED GOOD, BATTERY DISCHARGE LIGHT EXTINGUISHED. AIRCRAFT WAS ON JETWAY POWER AT THE TIME OPS GOOD ON APU POWER.