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The iPhone 6s has a smaller battery capacity, but same battery life as iPhone 6, according to Apple - 9to5Mac
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Amazon.com: Alpatronix iPhone 6S/6 Battery Case, MFi Certified Slim Protective Extended Charging Case with Built-in Polymer Battery Compatible with iPhone 6S & iPhone 6 (4.7 inch) BX140 - Gold : Cell Phones
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