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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Apple's new Smart Battery Cases sport larger capacity than previous versions
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Amazon.com: iPhone 6/6s/7/8/SE Battery Case Upgraded [6000mAh] Protective Portable Charging Case Rechargeable Extended Battery Pack for Apple iPhone 6 /6s/7/8/SE (4.7') - Black : Cell Phones & Accessories
Review: Apple iPhone 6s Smart Battery Case | iLounge
Review: Apple iPhone 6s Smart Battery Case
Apple Boosts iPhone 6S Battery Life With New Smart Battery Case