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  • Best Answer:

    Well considering what you do on your phone greatly alters the amount of battery life used its hard to say. However I can say its adds twice the amount of life. Without using my phone and having it attached it has lasted up to 3 days and even then still had life. Using it a lot I've managed to make it through an entire day plus another entire day once it finally ran out of juice and power only came from the phone. Overall I say the amount you pay for this cover is very worth it. It practically doubles how long your phone usually lasts. I give it 5 out of 5 stars.

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  • In the Mophie Juice Plus, which is only slightly thicker than the Mophie Juice Air, the battery fully charges a drained iPhone 4s, and then some. In other words, the Mophie Juice Plus doubles the life of the iPhone battery, so that it will make your iPhone useably for twice as long. If you leave the Mophie Juice in standby mode, and switch over when the iPhone 4s is nearly drained, the Mophie Juice lasts slightly longer. If you leave the Mophie Juice on, it will automatically drain first, then start to use the iPhone's battery when it is drained, but will give slightly less charge.

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  • Depends on how heavy a user you are, whether you are having data pushed to your phone, how much surfing and emailing you are doing.

    I'm a heavy user. My phone lasts til about midday and then the Juice Pak sees me through til I re-charge at night.

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