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Eneloops are NiMH (nickel metal hydride) technology. Nikon batteries are Li-ion (lithium-ion) technology. The power to weight ratio of Li-ion is at least double that of NiMH. For weight savings Li-ion is the only way to fly. Forget Alkaline, might as well carry a lead-acid car battery :-)
I would still like AA as the main battery in all of my cameras. I have a graveyard or battery types and chargers at home for cameras I no longer use (or have).