I disabled a lot. I download a lot of apps. I have most of them on automatic power saving or whatever, but still... But see, that's the thing, I don't understand why we have to disable everything to get good battery life. Obviously, the more you have turned off, the better. But I never had this issue with my iPhone. I think I had SOME of the location services disabled, but not all. I always had bluetooth, wifi, and the like turned on. But there's something I was doing right on my phone that my wife wasn't. Her battery life on her 6 never compared to mine.
But again, I really don't want to stew on battery life too much. It's fine for what I need it for and I still usually make it through the day ok.