Question about Samsung Eb-Bn910

So it's supposed to be an original battery, judging by the answers to some of the questions below. But others have been disappointed. I also bought a replacement "original" for about the same price from another seller. Unfortunately the battery I bought was terrible. I reported it to them, and they sent another that was only a bit better, but still not as good as my 2+ year old original. My current original battery dies after 2-3 hours of moderate use. Can I be confident that this battery from digitec will at the very least last twice as long as that?