Kastar High Capacity EN-EL9 Replacement Lithium-Ion Battery for Nikon EN-EL9 EN-EL9a EN-EL9e Battery, MH-23 Charger and Nikon D40 D40X D60 D3000 D5000 SLR Camera

After a quick charge the battery worked perfectly! Very satisfied with the purchase!

Awesome. had them 6 months now and no problems.Unbelievable price, i was going on a long vacation and wanted a back-up battery, so i bought this spur of the moment.This battery charges a little bit longer than the one that came with my nikon, but this one also lasts longer than the stock battery as well.When used as a pair (together in my battery grip) this battery with my standard nikon lasted me 6 days (also left my camera switched 'on' one whole night) on my vacation, with no recharge of either of them. i took over 2,500 pictures, and i still had juice left in them when i got home. really is a must buy if you dont want to hastle with lots of recharging.there arent many reasons not to try this out for such a low price.

It works with my D40X, charges quickly, and seems to have a long life. I shoot a lot of pictures and I rarely charge or change my battery; so I can't comment on the reliability of this as I haven't charged and discharged it enough times. I purchased this because there are times when I drain the battery but unless I'm leaving the shutter open for extended periods or just forget that the charge is low before a trip, it's very rare for me to drain a battery.This battery seems to last just as long as the OEM nikon en-el9, but as I said it's so far between charges I can't make a great comparison.

Quick fix when you need a spare camera battery.

I am an avid photographer, and when I'm constantly grabbing my DSLR and shooting as I go, a battery or two more is essential to my camera accessory arsenal. Right out of the box and charging it with my Nikon charger for an hour, this thing has been working perfectly. I notice no slow downs, or weird load-ups. I've been using it for about a week now, and have not had to recharge it. There has been no issues thus far with this battery. Definitely a good buy for the budget-minded person! Can't beat the price either.

It was good while it lasted. Perfect fit, worked in our Nikon charger. But after a year and a half it would not take a charge and we had to replace it.

I own several DSLRs and my Nikon D40 is one of my older ones. I had two original Nikon batteries for this camera and they both died recently after several years of use. I usually buy the original battery from the manufacturer because they are ALWAYS better. I have a MAHA battery tester and I know that the generics never have the same capacity as the original. So why am I writing a 4 star review for this battery? Well, because of the price. It has about 80% of the original battery and has been going strong for several months. Some of the generics I own are only 30-40% of the original! Imagine that! I really couldn't justify paying full retail for the Nikon for this battery. For an older camera that doesn't get much use, I can live with more frequent battery charges.

The good news and the bad news about the Nikon D40X battery is that it lasts a REAL LONG TIME! - so long, in fact, that I often forget that I need to charge it.Of course, since it always runs dry at the most inopportune moment, a spare battery was mandatory: I ordered the EN-EL9 Replacement Battery. It works great!Just be sure to try it out immediately upon receipt, and make sure it takes a charge from your charger. The first one I received was DOA and I had to request a replacement which Eforcity sent out right away - great customer service.