As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, THE MAIN BATTERY HOT LIGHT ILLUMINATED THE AIRCRAFT DIVERTED INTO MDT AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE MAIN BATTERY AT FAULT. REMOVED AND REPLACED MAIN BATTERY IAW DHC PROCEDURES, OPERATIONAL AND TEMPERATURE CHECKED GOOD. A/C RETURNED TO SERVICE. (M)