I see lots of people here easily getting 12 hours or more from their 6+. I have screen brightness set to auto and have one push email account on. This is my third complete charge and I can't even get 9 hours. Still running IOS 8.1. I doubt that I have a faulty battery. So, what are you guys doing to get 12 hours out of your 6+? Any suggestions would be much appreciated! Thanks!