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iPhone 6 and iPhone 6 Plus feature impressive battery improvements over iPhone 5s - 9to5Mac
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iPhone 6 battery life extended to 36 hours with Battery Case mod - PhoneArena
Weight, size, and battery life: how iPhone 6s and iPhone 6s Plus compare to their predecessors
Weight, size, and battery life: how iPhone 6s and iPhone 6s Plus compare to their predecessors
Controlled Testing Supports Apple's Claim of Nearly Equal iPhone 6s Battery Life With TSMC and Samsung Chips | MacRumors Forums
