As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - CREW REPORTED BATTERY CHARGER LIGHT ILLUMINATED AND CIRCUIT BREAKER POPPED IN FLIGHT. EMERGENCY DECLARED FLIGHT RETURNED DFW LANDED WITH INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED BATTERY CHARGER AND BOTH BATTERIES. SYSTEM GROUND CHECK NORMAL OPERATION.