I saw the terrible reviews of other batteries that claim to be original, but looks to me that they may be original but probably not new. This battery is definitely new, it may be not quite as good as the original battery of my Sony-Ericsson w810i but it is a good replacement. Time will say, maybe it will get better or it may get worst. But after one month I am not disappointed. I would love this battery made in USA not in China.