As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON PUSHBACK OBSERVED ELECTRIC LIGHT ILLUMINATED. ACFT GROUNDED. FOUND AUXILIARY BATTERY VERY HOT MAIN BATTERY COLD. PERFORMED FIM 24-31-801, REPLACED AUXILIARY AND MAIN BATTERY IAW MM 24-31-11. OPS GOOD. BATTERY CHARGER OPS CKS NORMAL.