Exchangeable Battery for iPhone 6S+/6+, iPhone 6S/6?
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12 Tips to Save Battery Life on the iPhone 6s - YouTube
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iPhone 6s achieves same run time with a smaller 1,715 mAh battery
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WAVYPO Battery for iPhone 6S, Upgraded 3200mAh High Capacity New 0 Cycle Battery Replacement for iPhone 6S Battery A1633 A1688 A1700 with Full Replacement Tool Kit
iOS 15.0.2 Battery Life Test - iPhone 6s vs iPhone 7 vs 8 vs 7 Plus vs 8 Plus Battery Test in 2021 - YouTube
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Battery Life and Charge Time - The Apple iPhone 6s and iPhone 6s Plus Review