As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OWNER REPORTED DEAD BATTERY. BATTERY FOUND TOO HOT TO TOUCH, AND DEVOID OF ELECTROLYTE. TROUBLESHOOTING INDICATED SYSTEM VOLTAGE TO BE 1.6 VOLTS ABOVE NORMAL VALUES. FOUND INTERMITTENT RESISTANCE IN ALTERNATOR CONTROL SWITCH. RECOMMEND REGULAR SYSTEM VOLTAGE CHECKS.