My iPhone 6 running iOS 9 was at 20% power last night. Got the expected notification and hit the new option to go to low power mode. Apple says battery life will be extended up to 3 hours in this mode at that point. I got @ 40 minutes till the phone went to zero battery and powered off. Which isn't even normal in regular mode for what I was doing. Reading on safari with minimal surfing on my home wifi network. (Note: I routinely keep all settings like mail push, background updates, and GPS off for best battery life) Anybody have experience to share?