From the iOS 5, there are users find the battery power is down quickly, Apple publicly acknowledged this problem is a result of the iOS 5 itself loopholes that resulting in power consumption and shorten the battery life.
The iOS 5.0.1 release is designed to improve the battery problem. However, from the description of the iOS 5.1.1 update, we did not find anything mention about “to improve the battery life”. The update release time has been a week, most of users feel the upgraded iPhone obvious has better battery. But there are still some users feel there is no difference at all.
5.1.1 The energy-efficient use of examples cited here: after upgrade 5.1.1 iPhone 4S inthe case of excessive use of standby one day more. Talking about here is the excessive use of open two Exchange mailbox account, push notifications, calendar appointment push notifications, contacts,Twitter, Google +, facebook and other push notification. Thebackground to keep running Beejive IM Instant Messenger, and Skype chat tool. We alsosee from the screenshot that the user can also open the positioning function, Wi-Fi capabilities. Nevertheless, users filled with a battery to the remaining 4 percent ofelectricity consumption, use of time can still reach more than nine hours.
In addition, the development of the iOS 5.1.1 jailbreak the pod2g also feel that the iPhone 4S upgrade 5.1.1 after the battery has indeed been improved.