Commercial Fixed Wing
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Communication Breakdown; Training / Qualification
Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Published Material / Policy
General Work Refused
Human Factors; Procedure
I discovered a motor scooter that gate checked and put into the cargo bin.  After calling our [company] Hazmat team and referencing both the Hazmat manual and the FOM; I decided to refuse a motor scooter.  It was similar to the Bird or Lime scooter that you can rent on the streets or big cities.  It had a Lithium battery that was 144Wh and could not be detached from the scooter.  The gate agent kept telling me it was OK.  The passenger was calm when I told him what my decision was and the gate agent is trying to return it to his family in ZZZ. The Undeclared Hazmat was removed from the aircraft. This is second time in two months that I've had undeclared Hazmat on an aircraft with [company name].  The Customer Service Agent and gate agents didn't understand my level of concern.  I would also like to know about these batteries earlier that's 5 minutes before push.
Air Carrier Captain reported refusing Undeclared Hazmat cargo during preflight. Lithium Ion battery powered mobility device was removed.