Post by Steve S raised an issue I hadn't thought about for awhile. I'd like to have a few extra batteries for my d2x. There are several aftermarket companies selling alternatives to the Nikon EN-EL4, such as Power 2000 and CTA. Anyone have experience with the aftermarket batteries, whether in D2x or any other Nikon DSLR? If they're done perfectly from a technical perspective, they could be as good or better. If not, they could cause problems with the camera. I remember in the prosumer Nikon world that many of the aftermarket batteries were way, way better than the Nikon batteries at battery life.