As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKEOFF FROM AIRPORT THE PILOT SMELLED THE BATTERY OVERCHARGING, HE NOTICED THE ALTERNATOR AMPMETER CHARGING AT APPROXIMATELY 60 AMPS. THE PILOT TURNED OFF THE ALTERNATOR AND MASTER SWITCHES AND PROCEEDED INTO THE AIRPORT USING HIS CELL PHONE AS COMMUNICATION WITH THE TOWER. THE BATTERY WAS REMOVED FROM THE AIRCRAFT AND FOUND TO HAVE A INTERNAL DEAD SHORT WHEN PLACED ON A CHARGER.