Flight Attendant Current
Communication Breakdown
Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Hazardous Material Violation
Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem; General Maintenance Action
Human Factors
Passengers boarded & travelled from ZZZ to ZZZ1. In ZZZ1; the passengers then boarded a [make/model aircraft] and boarded through the aft with their carry on bags. I saw their bags and let them know they were too big to fit in the overhead bin. Passenger stated they were told to bring them onboard as a carry on. FA A and I were trying to accommodate the bags and were then told by the Gate Agent they were smart bags & since the battery couldn't be removed; the bags would need to come off. The pax were deplaned along with their bags. FA A stated the passengers were with us (along with their bags) on the previous flight. I did not see them board with their bags on the original flight.
Air Carrier Flight Attendant reported passengers were denied boarding due to carry on smart bags with non removable batteries.