I was planning on getting an extended battery, since I use my phone quite often and I'm a terrible battery conserver. Is the standard Motorola extended battery the best one, or have others come out? I'm pretty new at all this. Also, I have the Otterbox Defender case, which I love. I heard that th extended batteries won't fit at all with it though. What's a comparable case (or the closest) that will fit with the honking battery in? Thanks for the help!