The iPhone 6s has a smaller battery capacity, but same battery life as iPhone 6, according to Apple - 9to5Mac
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Exchangeable Battery for iPhone 6S+/6+, iPhone 6S/6?
Weight, size, and battery life: how iPhone 6s and iPhone 6s Plus compare to their predecessors
iPhone 6s Battery Replacement - iFixit Repair Guide
Exchangeable Battery for iPhone 6S+/6+, iPhone 6S/6?
Exchangeable Battery for iPhone 6S+/6+, iPhone 6S/6?
Exchangeable Battery for iPhone 6S+/6+, iPhone 6S/6?
Weight, size, and battery life: iPhone 7 vs iPhone 6s
Battery Life and Charge Time - The Apple iPhone 6s and iPhone 6s Plus Review
iPhone 6 Battery Replacement - iFixit Repair Guide
Exchangeable Battery for iPhone 6S+/6+, iPhone 6S/6?
Exchangeable Battery for iPhone 6S+/6+, iPhone 6S/6?
Exchangeable Battery for iPhone 6S+/6+, iPhone 6S/6?
iPhone 6 vs. iPhone 6s Buyer's Guide - MacRumors
iPhone 6s' and iPhone 6 Displays Compared in New Video - MacRumors
Exchangeable Battery for iPhone 6S+/6+, iPhone 6S/6?
Review: Weak battery aside, Apple's iPhone 6s Smart Battery Case isn't as dumb as it looks - 9to5Mac
How To: iPhone 6S Battery Replacement done in 2 minutes - YouTube
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Apple launches Smart Battery Case to extend iPhone 6 and 6s battery life. – Campaigns of the World®
iPhone 6 Battery Size Leaks
