I am missing the battery and holder for the dx4 hd video drone,missing when I purchased it ,hhow can I get a replacement.

There should be paperwork in the box that has manufacturer contact information. If not, you can probably google the manufacturer name. You might even be able to find the parts that you are needing on ebay or some other retail source. Maybe take it back where you purchased it and exchange it for one that has all of the parts.