Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Communication Breakdown
Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors
Parked aircraft at gate in ZZZ1. Ops Agent notified us we carried a aircraft battery and had not been notified of the HAZMAT Cargo.  Contacted Dispatch and informed them of the situation.
We departed ZZZ with HAZMAT aboard which was not disclosed to the Flight Crew. We were notified on arrival to ZZZ1.
Air Carrier flight crew reported being notified upon arrival by Ops Agent of undocumented aircraft battery was transported on their flight.