I broke the battery clip of my Nikon D800 quite some time ago. I’ve been trying to replace it but it wasn’t easy as most of nikon service centers does not service D800 camera and it had to be sent to Nikon and not having the camera for days or weeks was not an option for me. I was able to find the battery clip on e-bay for relatively cheap price. But challenge was, I did not know where all the screws and clips to unassemble D800. Without schematic, I wasn’t comfortable disassembling the camera so I looked for bottom plate for D800 on e-bay. Then I understood where screws are based on the picture. With Much more confidence, I proceeded as follow.
Remove the Battery Cover by lifting it.
Remove the Rubber cover to reveal the screws. Once the Rubber piece is removed, inspect it for tackiness. If it’s still tacky and would need extra glue to put it back on later, store it in dirt-free area for now.
Once you unscrew 8 screws, you can also lift bottom plate and reveal the battery clip mechanism.
Before removing broken battery clip, remeber the spring position. Then lift broken battery clip to remove it. – make sure that sping does not “spring” out and goes under the table and loose it. I sort of covered the area so even it spring out, it would not go far. Put the spring and battery clip back on as it was.
Put the bottom cover back on. you could put the screws as in step 6b and then test the clip. Make sure it moves freely and spring back into position.
Put the Rubber cover back on. I was able to put it back on with out extra glue since it was still tacky.
I hope this was helpful to repair your battery clip on Nikon D800 camera.