Is there any information inside the battery case or on the battery? If not, then this is what I would recommend.
You will need to take some useable photos, no shadows, no dark backgrounds, on a plane white background.
First photo, straight on, slightly above so the front and some of the top is visible, a one photo from each of the right and left side…
Now with the photos on your computer or device, drag the photo into the search box on the Google web page and enter some meaningful information (drone or any information on or graphic on drone).
Google may be able to match your photo up with an advertisement or a previous posting…