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Question: I just bought this for my my Nikon D5100 and it says that it isn't compatible. Is there some sort of trick to get it to work..?
Document: I guess I have to give this 1 star since the system won't let me give it zero. Regardless of what some on here have said in the reviews, this battery does NOT work with the Nikon D3100, unless there is some way to trick the internal system of the camera (or perhaps if you are using an outdated firmware version). After putting this battery in you will get an error message stating that it is not usable with this camera.
I purchased this battery for my Nikon D5100 camera 6 months ago. The battery worked well for those 6 months, although it never took as many pictures on a single charge as the Nikon battery that came with the camera. Then, yesterday, I put the battery in the camera, and I get an error message saying the battery is not compatible with the camera,  Nothing changed since its last use, it was just suddenly and inexplicably incompatible.
Battery works in my D5100.I had tried another battery for my D5100 which turned out would only work with the purchase of a grip and playing a trick on the camera.
I did a lot of reading that Wasabi is decoded and would work with my Nikon P7700. I bought it, tried it against original EN-EL14. The conclusion: you get very reliable, equal to EN-EL14, but at half the price. Very, very good!! !
About a year and a half ago when I bought my D5100, I decided to look for some spare batteries since you never know if you'll lose one or you just need some extra juice on a particularly long day. I looked on eBay and bought a couple that said they were EN-EL14 compatible, but did not specifically list the D5100 (though they did list the D3100 and, as I recall, the D5000).
Considering the ridiculous cost of OEM Nikon batteries, these rock.Since I have only confirmed they work, I can't speak to longevity yet. If they are as good or close to my original battery, I'll be a happy guy. If not, I'll revise this review.UPDATE:  both units I bought don't hold a charge. I get about a third of the battery life of the Nikon OEM battery. For the money, I'd get a real Nikon battery.
This worked out perfect. After a ton of reading about non-Nikon OEM batteries having issues I was a little leary about picking one up. BUT !! the description says that it'll work and Guess what.. It works perfectly no non-battery issues and the Nikon D5100 Even shows the amount of power left remaining just as if it had the OEM battery in the camera. Also it charges just fine with the Nikon OEM charger ! !Will definitely purchase again when due for extra batteries.
I shared my experience looking for a cheaper alternative to Nikon-branded batteries. Shortly thereafter, I was contacted by a representative from Blue Nook who told me about their chipped "Wasabi Power" batteries which were recently "chip" decoded to work with the D5100. After a bit of skepticism I agreed to test out his battery which I was able to get for less than half the cost of what I paid in Best Buy. The best part is that it arrived in 1 or 2 days.
After reading about compatibility issues I finally sorted out that my new Nikon D5100 needs batteries that are either OEM (Toooo Expensive!) or that are decoded. Got two Wasabis, charged them and they work just fine. My Nikon thinks they are OEM. I'm using two in a grip because I need lots of power to shoot video. Shot 40 minutes today in several segments, no power issues, so these batteries get a Five Star recommendation. Also were delivered very quickly in solid packaging to avoid damage.
We bought this battery as a backup for our Nikon D5100 for a trip to Disney World a couple months back. The battery charged in the Nikon Charger and worked in the camera the first time, however after we charged the battery the second time, it would no longer register in the camera. The battery will still charge, but every time we insert it in the camera we get a message saying "this battery cannot be used. Choose battery designated for use in this camera."
Answer: Not sure if this will help or not. I bought the same battery for my Nikon D3100 some time ago and it worked fine. Nikon then released a firmware upgrade for the D3100 and apparently this upgrade stopped the Wasabi battery from being compatible. Fortunately (for me) I read about the incompatibility before I knew that the Nikon upgrade was available so never installed the new firmware. I suspect that something similar has happened with the D5100.