Apple says iPhone 6s and 6s Plus battery life may vary 2-3% regardless of Samsung or TSMC chip - 9to5Mac
iPhone 6s Plus Battery Capacity Confirmed Smaller Than Predecessor
iPhone 6s Plus Has Smaller 2750mAh Battery - MacRumors
iPhone 6 Battery Specs | Full Specification Details
iPhone 6 Plus gets torn down, monstrous 2915 mAh battery found inside | iMore
How Many mAh to Charge iPhone 6 & iPhone 6 plus
iPhone 6s achieves same run time with a smaller 1,715 mAh battery
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LEAKED: Here's How Much Bigger The iPhone 6's Battery Will Be Compared With The iPhone 5s'
Exchangeable Battery for iPhone 6S+/6+, iPhone 6S/6?
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iPhone 6 – Battery Life and Verdict Review | Trusted Reviews