Im not gonna pretend im as clued up as win2win on IT....but I know a rip off when I see one...I looked at getting iphone on the end of my last contact....I couldn't believe the battery was sealed...really the bain of all cellphone users...I asked salesman what happens when the battery has given up holding charge, how do I replace it....he said you cant...he said most people replace their phone annually thus not needing to replace battery.....I still got phones...phones years old still giving immeasurable pleasure in the Philippines all on the strength of replacing batteries.