Broken battery clip? How to fix?
Battery clip won't hold battery in place anymore? How to fix and/or where can I take it to get it repaired
The Nikon D700 is a 12.1 MP FX-Format CMOS Digital SLR Camera with a 3.0-Inch LCD.
I would consider you to doing the following.
If above method is not suitable for your device then don't be dissapoint just read the article Hadware Troubleshooting under Nikon D700 Manual.