As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LCH - FLIGHT 2830, THE CREW REPORTED A BATTERY 2 OVERTEMP WARNING ON EICAS. THE AIRCRAFT DIVERTED TO LCH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE NUMBER TWO BATTERY, OPERATIONALLY CHECKED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (A)