[JJ_SO]

You'll need the battery, the charger and a cap for the battery door besides of the grip. There were a couple of special offers combining all these things, when the D850 was introduced. It's also not a waste of time to look into the manual. Page 260.

 

Roughly 850 $ for just 2 fps more? And getting a device which is not very stable to use with a tripod and doesn't give you any extra function - I had three or four of these grips, not any more: With the D850 I stopped the grip aquisition syndrome 

 

Geting the (comparatively) cheap one from Fuji for X-T2, I had to realize "others do a bettrer Job on grips than Nikon".

• compartment for 2 additional batteries.
  
• charging socket in the grip - no need to take out the batteries.
  
• mechanically, the Fuji is superior to any Nikon grip.
  
• additional sockets for headphones (no need for D850)
  
• Came with AC transformer to operate the camera without batteries (that costs 150.- additional from Nikon)
  

Nikon, if you like to sell me a grip, it has to have:

• charging socket
  
• stable housing, preferably with Arca type bottom plate
  
• identical buttons and knobs like the D850. I don't understand why Nikon has to make extra buttons which work slightly different, especially the dials
  
• to be a complete package with EN-EL 18b
  
• a GPS module inbuilt.
  

Everything lesser is just a bold grip into my pockets and I became allergic to that.