What if you ran Low Power Mode on your iPhone all of the time? That's the question that Matt Birchler asked, and he was curious enough to try the experiment for himself. The results are quite eye opening. Low Power Mode doesn't necessarily have to be a feature that you only use to eek by on a small percentage of remaining battery...
The new Low Power Mode option in iOS 9 allows users to eek out more battery life by disposing battery draining features such as parallax effects, throttling down CPU performance, and disabling background app refresh. In all, Low Power Mode can provide users with up to 3 additional hours of battery life.
In iOS 9, Apple is allowing Find My iPhone's Lost Mode, a mode that lets you to mark your iPhone as being lost, to use Low Power Mode at the same time. By doing so, lost iPhones have an even greater chance of recovery due to being able to stay on for a longer period of time.
iOS 9 has some significant new power saving features that will lend users up to an additional three hours of battery life. Dubbed Low Power Mode in iOS 9, users can eek out up to an extra 3 hours of battery life with the option enabled.
Low Power Mode works by disabling animated wallpapers, Mail Fetch, Background App Refresh, motion effects, and, as recently discovered, throttling the CPU.
Power Saver Mode, a new iOS tweak developed by Elijah Frederickson, tries its best to provide many of the same benefits to jailbroken iPhone users on iOS 8. Power Saver Mode increases contrast, enables Reduce Motion, disables Background App Refresh, location services, Cellular Data when on Wi-Fi, and more.