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If you are facing and bearing iPhone battery problems such as it runs out quickly, do not blame Apple yet. You might be not using your iPhone in an optimized iOS setting that could make your iPhone use less power constantly.
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iOS 9 seems to be provided with Low Power Mode, however, to dick deeply, there are totally 34 tricks to maximize your iPhone Battery life. You might want to look at our particular tips and tricks to iOS 9 – Maximize, improve and save iPhone Battery Life in iOS 9