Just add the toggle switch Power saving mode from the quick panel. If you want high processing toggle enhanced processing and your good to go. Anything in-between you have to go into settings to manually make medium mode. Since power saving mode is no loner restricted to a few apps if you change the launcher you can easily run power saving mode and a custom launcher and get 2 or 3 days battery life easily. As long as you don't mind the processor being throttle down dramatically.