World's Thinnest Battery Phone Case for iPhone 7/7+

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I have the iPhone 6 version and totally love it, using it right now
Have to invite friend to get 50% off. Message before sign up was misleading.
How much will it cost and how long does the charge last?
I was one of the lucky ones that got the one for the 6s. Best battery case in the market.
What are the dimensions?