As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 MAIN BATTERY HAD MOMENTARY BATTERY OVERHEAT RED LIGHT INDICATION. CREW EXECUTED EMERGENCY CHECKLIST; ISOLATED BATTERIES FROM CIRCUIT, DECLARED AN EMERGENCY WITH ATC AND LANDED AT NEAREST AIRPORT (KLGC), LAGRANGE, GA. AIRCRAFT WAS SHUT DOWN WITHOUT INCIDENT. BATTERY WAS REPLACED.