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I use a mophie powerstation pro. It has a USB socket so you can plug any USB compatible cable in. It carries a lot of juice and it will remain charged for a very long time. I've used it months after charging. I also have a mophie juice pack and use it as a combination protective case and battery pack so I don't need to worry about recharging the phone, it uses the external battery first and then the internal iphone battery.
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