Just received new Neewer Battery Grip for D800. Arrives in perfect condition, Grip Looked good (Although small piece of rubber corner already loose) but fails to work with battery grip nikon battery, nor with 8 AA batteries. I have an original Nikon MB-D10 for Nikon D700 that never gave any problem - photoshoped to save some money for the D800 grip but Seems I wil have to now buy the original Nikon grip.