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This review is from: High Capacity EN-EL9 Replacement Lithium-Ion Battery for Nikon Digital SLR D40 D40X D60 Digital Camera (Electronics)
I purchased this battery as a backup to the Nikon brand battery, and yes, it's a much cheaper alternative to the Nikon brand battery; however, when I charged it up and put it in my D3000 the first time, it wouldn't provide enough power to show the shot I just took in the viewer and would no longer allow me to access the menu options. Although this didn't drain the battery much, and I could still take photos, it causes me to have to turn off and on my camera between shots to view my shots or access the menu options. Since I'm sure this can't be good for the camera, I don't foresee myself using this battery at all and I'll just keep my charger handy for the Nikon brand battery.