Has iOS 5.1.1 Improved Your iPhone’s Battery Life?

Ever since Apple launched iPhone 4S, some users have complained about poor battery life.
Apple released iOS 5.0.1, which included bugs fixes that affected battery life, but iPhone 4S users still complained that it didn’t fix the issue in their case and in some cases users (not just iPhone 4S users) complained that they started observing the issue only after upgrading to iOS 5.0.1.
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