I'm emailing my seller...hopefully I just got a bad battery and he'll send me a new one. The stock battery performed as well or better than this. Once this thing hit 30%, it was over within minutes. Also would drop from 100% to 95% within a few minutes, whereas the stock battery will sit at 100 for nearly an hour. Maybe it would get a little better with more use, but since I don't plan on using it on a daily basis, I don't have the patience - I want my phone back in its case.