Being able to adjust power management settings from a range of profiles (or an app - by - app basis) is no longer possible. (jmcomms.com)
In my tests, I consistently got between 5 and 6 hours of operation in working sessions, using normal power management settings and occasionally stepping away from the device. (zdnet.com)
The Xperia Z's software includes a new power management settings area featuring various tweaks to lengthen the phone's battery life. (androidcentral.com)