Hello There, I make time for education: The battery for the D40 and D60 is an EN-EL9. The battery for the D3000 and D5000 is a EN-EL9a. From what I know, the two batteries are visually the same, but not quite the same when it comes to specifications. The EN-EL9a battery has 7.2V voltage, the EN-EL9 7.4V. Since the EN-EL9a has the lower voltage, the battery has a bit more capacity, namely 1080mAh instead of 1000mAh (both for the original Nikon battery). Both batteries should be fully compatible - I read but nothing official. I ordered the battery and come is a spare battery with 7.2V voltage - ie an EN-EL9a. The indication on the battery 1400mAh says. Therefore fits securely around my D5000. But: Accordingly, the technical Specifying are here at Amazon is not quite right or just describe the EN-EL9. The battery is of Phottix (Phottix's got a website) and is mechanically fully compatible. He too does not fall when opening the battery compartment of a D5000 from the tray. The "stop function" is also achieved here. The shop works in the original charger by Nikon properly, the camera does not mosquitoes, not to accept the battery. OK then! Because I can not tell the difference. Of course, the situations are never the same over the life of the battery but I would say this replica holds even a little longer. The battery is excellent processed, the plastic feels only slightly cheaper as the original. The spare battery comes with contact protection. Therefore: strong buy recommendation, I do not see why you should not buy it.
small update: now 9 months old and runs like the first day ... small update: 02/2013 - still runs without a murmur, not of old age - the past six months not used. Match Update 02/2015: still runs without complaint ... Greeting, Rounder6
