YEP! I got my 3rd pty batt with my 2dxs in stead of a 1 gig card. If I took off the labels, I doubt if any one could tell which is which. The only diff is that the Nikon has that little 3D hologram on the bottom of it.Dont have a D3, but I have no issues with Promaster batteries in my D300 or D70. Nikon doesnt make batteries. Just has someone else make them and slap their name on them. Wouldnt be surprised if Digi-power, Promaster and Nikon batteries are all made at the same company.