I liked the price on amazon, so I bought this Nikon brand battery for my new Nikon D40x 10.2MP Digital SLR Camera with 18-55mm f/3.5-5.6G ED II AF-S DX Zoom-Nikkor Lens. So far, so good. The battery charges fairly fast and lasts a long time.
I'm a firm believer in having at least one extra rechargeable battery for a digital camera. If you take a lot of pictures, you have a good chance of your battery running low while you're out and about. If you don't use the camera often, you might take it to a special occasion without realizing that the battery's getting low. In either case, having a spare fully charged battery will help you avoid the frustration of having a dead camera at the wrong time and place.
I'm okay with paying a few extra bucks for the Nikon branded battery, based on my experience with two "no-name" rechargeables I bought a few years ago for my Nikon Coolpix 7900 camera. The "no-names" cost less than the Nikon brand battery. They charged up and worked just fine at first, and I rotated all 3 batteries through the camera, with roughly equal amounts of use and recharge cycles for the batteries. All rechargeable batteries eventually lose their ability to hold a charge, after going through a number of charge/discharge cycles. In the case of the Coolpix camera, the original Nikon battery outlasted both of the "no-name" generic batteries.
So based on my experience with those batteries, I'm sticking with the Nikon brand for the extra battery for my D40x, because I expect it to last through more charge/discharge cycles over its lifetime than a generic (and cheaper) equivalent battery. Nikon EN-EL9 Rechargeable Li-ion Battery for Nikon D40 and D40x Digital SLR Cameras
If you are looking for a spare battery for your D40, I recommend you purchase the Nikon accessory kit instead (comes with a great Nikon camera bag, spare battery identical to this one and a photo guide). It barely costs more than this battery alone and you will get the bag for almost nothing.
I use this in my Nikon D60. The only reason I didn't give this battery 5 stars is that it is a bit pricey. Having said that however, I wouldn't buy any other battery for something as important as my digital camera. I've tried knock-offs before and have been very disapointed. This official Nikon battery however has not disappointed at all. It has a very good life and I never worry in a critial situation.
Easy to use and rapid. Can be used on 220 Volts while travelling abroad and requires only an adapter for the outlets, alhtough I followed Nikon's recommendations and purchased a cord for use on a 220 Volt line. (These cable/cords can be found in stores abroad which sell cameras, electronic appliances and computers)
When I bought my camera, it came with a Nikon battery. I bought another brand battery as a backup. Recently, I noticed that the other brand had become hard to get out of the camera - when I examined it, it was expanding. The center was swelling, and was getting ready to burst. The original equipment battery was just fine, so I ordered another Nikon brand battery. Also, be wary of "lower cost" vendors - one I contacted was just a scam, they offered a low price on the Nikon, but then said it was on "nationwide backorder" and they wanted me to buy an off-breed for a higher price. Needless to say, Amazon got the right battery to me for a good price - and I had it in less than a week. - Nikon - D40 - Digital Slr - Nikon D40'
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