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Great for D40 battery life, Simple 11/08/2013
This review is from: Opteka Battery Pack Power Grip for Nikon D40, D40X, D60, D3000 & D5000 Digital SLR
Simple battery pack that holds two EN-EL9 batteries or use the included AA adapter cartridges to use 8 of your favorite rechargeable AA batteries (or regular). Solid construction and engineering mean you don't have to worry about damage to camera.
None for standard battery life uses.
Some photographers look for bases with a bit more to them, but this is simply a battery extension adapter. I was able to charge two EN-EL9 battery packs and walk the entire Smithsonian National Zoological Park and the majority of the National Air and Space Museum, filling nearly two 32GB SDHC cards, before I ran out of juice. Very please with Opteka's products.
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