As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, THE BATTERY HOT LIGHT CAME ON, THEN THE BTTERY OFF LIGHT CAME ON. THE PILOT FOLLOWED THE EMERGENCY CHECK LIST AND LANDED. THE MECHANIC REMOVED AND REPLACED THE BATTERY, OPS CHECKED PERFORMED AND THE AC WAS RETURNED TO SERVICE. (K)