DJI inspire battery cover with space to insert insulating material to keep battery warm. Also on the rear is a slot for a camera hot shoe mount screw plate, for attaching secondary camera monopole.
this is FREE to use, do what you want with the file.
just a note for those that print it, on the inside right at the back where the dji back plate slots in there is some support material that needs to be removed once printed, it comes out easily it just difficult to see as it blends in.