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There have been complaints about it. Ars Technica did a comparison on battery life with iOS 7 vs. iOS 7.1. The results were mixed - some devices showed slightly better battery life, some showed slightly worse. The differences were relatively minor either way for the most part, although the iPad mini showed nearly an hour loss of WiFi browsing time with 7.1. On the other hand, the iPhone 5 showed a 16 minute improvement.