As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO OVERHEAD BATTERY DISCHARGE ILLUMINATED STEADY UNTIL LANDING. AIRCRAFT DIVERTED AND LANDED SAFELY AT MSY WITHOUT FURTHER INCIDENT. PERFORMED ELECTRIC LIGHT BITE AS PER FIM 24-31-00. FAULT CLEARED. OPERATIONAL CHECK GOOD.