Hello Kelly
If you look at the D850 battery grip from the rear of the camera you will see a small square piece of rubber, if you peel this back it reveals a port access, Below explains it better.
When using the EP-5B power connector, insert it into the MS-D12EN holder with the arrow (E) on the connector toward the battery holder power terminals (
). Press the connector lightly downward and slide it in the direction of the arrow until the power terminals click into place (
). Open the holder power connector cover and pass the EP-5B power cable through the opening (
).
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Kind Regards
Roy
