To good to be true I think
I'd also love a battery which claims what this one does at this price, but It seems to good to be true. A bit of Googling shows a review for this battery with 2/2 "average" reviews which show it did not perform as promised (but it did work). There are also some other review sites which say pretty much the same thing. (I'd love to post the URL but can't because I'm a noob. A search for B005O8S4V0 on amazon.co.uk will find this.
Also, I think that if this technology was legit Samsung would have shipped it with the unit itself !!
Pity, I was really hoping it would work. I hate it that all the aftermarket batteries I have purchased sucked compared to the original.