I don't understand. What evil dark magic did Apple do to the battery or to iOS 9 to deliver such excellent battery life? I was already extremely impressed with the results on my iPhone 5s after updating, but now the difference is so much more apparent on the 6s. At this point I'm on my way to getting the same battery life as my Galaxy Tab S, which has a 5x bigger battery (although a much better display too). EDIT: I couldn't, but it was very close. Still impressive. Stats: TSMC iPhone 6s, iOS 9.3 PB3, set up as new, Background App Refresh turned off, no fetching whatsoever, 30-50% brightness, most apps closed, mostly using texting apps and SoundCloud (little social media).