I was getting about the same battery life as Mustang the year I had my Droid Maxx. I ran with GPS in High Accuracy Mode all the time, screen brightness on Auto and could normally get 3+ hours of screen on time every day using my phone and still only be at 50% at night when I went to bed...about 14 or so hours off the charger. No special settings, or anything for me. But.....I am not a social media user. I never use Facebook, Instagram, or any other social media app. My wife and daughters on the other hand....they use them all. Especially Facebook and Instagram. They are always looking for an outlet every 6 to 8 hours. Just my opinion, but those apps kill your battery.
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