I've never bought an extended battery before. Ever. So I'm thinking about buying one to extend the life of my phone. What are my best options? Right now I can get through the day keeping brightness down and toggling connections on and off constantly. I'd like get comfortably through the day with some brightness on and maybe a consistent LTE connection. I don't need 2-3 days out of it. Are there any out there that would accomplish this without doubling the size? IF not, what are the best options? Also, what would my case options be then? Thanks. FYI I did search, but it just confused me more. Like I said, I know jack crap about extended batteries.