I recently purchased a used mini 4K (drone only). It is not account bound. There is a serial # in the battery compartment. When I go to the DJI website and enter that serial # , the response I get is detailed and includes activation date and confirms that a warranty is in effect until July 2026. When I connect to the my controller, and go to PROFILE>DEVICE MANAGEMENT, the serial # is different and the drone info like activation date is different, and warranty specifics are different. One serial # has warranty left, the other does not. I am confused. How can one drone have 2 serial #'s???. Thanks to all that respond.