Apple is confirmingwhat owners of the iPhone 4S and other iOS devices already know: The latest version of its mobile OS — iOS 5 — seems to suck more juice than the previous version. The company says it plans to release an update to address the problem. Apple initially promised that the power-efficient A5 processors in the 4S would deliver eight hours of talk time on 3G, 14 hours on AT&T's EDGE network, six hours of 3G browsing, nine hours of Wi-Fi, 10 hours of video and 40 hours of listening to music. But users have been complaining that they're getting far less than that, and that they need to charge their iPhones and iPads far more frequently than they did when they were using iOS
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