As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CREW REPORTED AUX BATTERY HOT WARNING IN CRUISE. AIRCRAFT DIVERTED TO AN ALTERNATE AIRPORT (YQB) AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE AUX BATTERY AND THE AIRCRAFT RETURNED TO SERVICE. REMOVED AUX BATTERY PN 020413-000, SN 090520007EE67. (TC# 20190703016)