I have a laptop at home. I bought it sometime in November 2010. For 7 years, it is still working efficiently except its battery which could easily drain. I try to find a replacement. I couldn't find here in our local mall. I try the online store and I get one, the same specification with my original battery. When I replace the old one with the new one, it doesn't work. Anybody who is computer savvy or nerd here, what is wrong with the battery?