I know I know, I haven't set a Guinness record but, my iPhones 6S+ battery has finally gone below 49% after 12 hours of use. I've sent out and read a dozen emails, I was on this forum for 4 hours, checked weather 5-6 times, applied for 8 jobs, looked at porn on porn hub for 30min, used google calendar and added new appointments, made 8 10min phone calls, used map navigation twice total of 20min, sent 15 texts, googled a dozen things, used WhatsApp twice 3min each time, updated 2 apps over wifi. And the current battery level is 48%. Yes the iPhone is 2 weeks old, but I don't understand why so many people are complaining about poor battery life. I have implemented every battery saving feature, perhaps that was the key. Running iOS 10.3.3. I'm happy with the iPhone as my first Apple iPhone. Just wanted to share my positive experience.