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Amazon.com: Battery Case for iPhone 6s Plus/6 Plus/7 Plus/8 Plus 8500mAh, Rechargeable Charging Case for iPhone 6Plus Extended Battery Pack Charger Apple 6s Plus Portable Power Bank Cover for 7Plus 8Plus (5.5”) :
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iPhones 6S battery life 'varies by up to two hours depending on chip supplier' | Apple | The Guardian
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