As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT DECLARED EMERGENCY ON ACCOUNT OF SMOKE SMELLED AND SEEN IN THE COCKPIT, MULTIPLE SYSTEM FAILURES. MAINTENANCE FOUND NUMBER 1 BATTERY TO HAVE OVER TEMPED. REMOVED AND REPLACED BATTERY AND CHARGER IAW AMM 24-38-51-0401 AND 24-38-34-0401. PERFORMED OPS CHECK OF BATTERY CURRENT LIMITER IAW AMM 24-38-00-710-001-A. AC OK FOR SERVICE.