As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2280, DURING CRUISE FLIGHT THE CREW REPORTED A BATTERY ONE OVERTEMP. THE AIRCRAFT RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND THAT THE NUMBER ONE MAIN BATTERY WAS SHOWING 117C BUT WAS COOL TO THE TOUCH. MAINTENANCE REMOVED AND REPLACED THE BATTERY, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.