Hello I received a new mavic mini from DJI today and found this inside the battery compartment Can anyone tell me what it is and do I need to return the drone.

Hello there skyhi. Thank you for reaching out and for posting this information here at DJI Forum. Since these is a loose part inside the battery compartment of your DJI Mavic Mini. Have you tried powering the said said DJI drone on and it would be best to the seller of the said DJI Drone or contact our DJI Support Team at https://www.dji.com/support for further assistance. Again I am sorry for the trouble and thank you.

Heat spreader for something? Or debris from factory?

This is DJI Spark discussion thread! You wrote wrong section!