STK EN-EL9 EN-EL9a Battery Replacement for Nikon D3000, D5000, D40, D60, D40X

I have an old D40, had always had exceptional battery life with it, but decided I needed a new backup battery when one of my Nikon branded ones stopped consistently charging. Turns out it was the branded batteries not seating correctly in my official Nikon charger. These batteries solve that issue. As newer batteries that I treat better than my originals, they hold charge much longer, and seem to cycle better. That could be that I know how to charge Lithium batteries better than in 2008, or it could be they are better built.Either way, these are a good product with a better-than-original sales price.

Bought these for a 2 week vacation because the battery that came with my D3000 (9 years ago) was no longer holding a useful charge. This battery worked great, fits perfectly in the original charger and I was never able to drain it in a day. The battery is exactly what I needed and I would buy another if this one disappears. A+

I usually purchase "prime" batteries for my better photo gear, but good results from the experiences of friends made me take a second look at these.The STK's Nikon EN-EL9/EN-EL9a Battery is designed to work with a variety of Nikon D-series cameras. It is rated at 1400mAh, whereas the original Nikon EN-EL9 Rechargeable Li-ion Battery is rated at 1030mAh of power. Either these from STK or the original use the Nikon MH-24 charger.Bought a pair of these for use with my DSLR Battery Grip, which has been in service for a couple of years now. When one of the Li-ion EN-EL9 substitute batteries from another third-party seller showed up as swollen on one side, I knew that it was time for a change. As an added note, be very careful when messing around with a swelling Li-ion (Lithium ion) battery as these can be quite dangerous. Once a Li-ion battery starts swelling, its been damaged and must be disposed of in a responsible manner. They can explode and cause fires. Enough said.Have put these through a number of use cycles in the battery grip, and so far they perform as well as the original Nikon EN-EL9 Li-ion batteries, and at a much more reasonable cost. One cannot ask for more than that.JW ▪ 4/15/2014

I didn't know if I'd like the plain black casing at first. I thought it would look cheap and "after market", which it is after market, but I actually think it looks better than the OEM batteries and very sleek. The problem is they didn't seem to work that well with the OEM charger that came with my Nikon. One wouldn't charge at all, one only charged sometimes. After I received my order, I got an email from their customer support team asking me how everything was. I described my experience. Several days later, I got a package in the mail from them, free of charge, with a wall charger and a separate 12-volt car charger. Haven't tested the car charger yet, but the wall charger worked great and holds the battery much tighter than the OEM charger. Love it! Docking a star just so people are aware of the charging issue, but 5 stars for customer service.

Arrived quickly, Charged fine in the Nikon charger and worked in the camera. Haven't tested it for battery life yet but if it performs less than the factory battery I will revise my rating. Using in a Nikon D3000.Overall Recommendation: I wouldn’t hesitate to purchase this product.Update September 14, 2016. I've been using this for over a year in conjunction with the original camera battery and it still performs well.I paid full price for this product. My reviews are honest and reflect my opinion on the product based on the advertised price regardless of the price I actually paid.If after extended use, there are any significant changes or the product fails to perform as expected, I will update my review.Thank you for taking the time to read my review and feel free to ask any questions. If you found this review helpful, please click “Yes” below.

Great replacement for stock Nikon Battery.I have been using this battery for 9 months now and have had no issues with its use. It lasts a long time between charges, charges as you would expect, and is ready to go again.I've had a couple lemon replacement batteries, but this one is still going strong.Highly recommended, great value for a replacement or just a spare battery. You never want to be in the middle of the museum or day out with the kids and run out of battery without a spare.

I cannot believe I bought this battery at bestbuy for nearly 100.00. That battery is loosing its life because of the memory. I much rather these loose their life because of memory then the original one I bought for obvious resays. I bought this several months ago and they work like a charm. Charge well too. The only thing is the light on the charger goes wonky so I do not use that as an indicator that it has finished charging.