Total guess: try cleaning the battery contacts, AND blow air from rocket blower (or compressed air if you must) into the battery compartment while camera is "upside down" so any particles can drop out. Also clean contact points in charger. I think you can use isopropyl alcohol & "Q-tip" to clean the contact points on the battery & charger (not in the camera battery compartment though). Some people use a pencil eraser to clean contacts and you can then blow that residue out of the camera battery compartment.
Recharge battery - set camera to manual - check meter by pointing camera at several different intensities of light- focus - try to shoot. Try again with auto, program, aperture, shutter.
Failing this, time to visit a Nikon camera shop and see what they think.
Hope all goes best for you! Let us know what happens, please.