Good News! The Battlefield 4 DLC’s or the Premium Edition DLC are now free to download on Origin, these includes Dragon’s Teeth, Naval Strike, China Rising, Second Assault and Final Stand.
Note: You still need the base game Battlefield 4 to avail this offer.
The Free DLC is also available on Xbox One, Xbox 360, Playstation 3, Playstation 4 and PC.
You can download all DLC on this link https://www.battlefield.com/news/road-to-battlefield or on your Origin Client..