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"RE: Nikon batteries"
The Nikon USA site is not clear. The batteries are not listed a interchangable but they use same the charger. The EN-EL9 and EN-EL9a are listed as a replacement part for the D5000. You might want to ask Nikon USA tech support.Once you register your camera with them, you will have access to the Nikon USA tech support site.
GeorgeMy Nikonian Galleries