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iPhone 6S has twice as much RAM as iPhone 6, teardown confirms - The Verge
iPhone Battery and Performance - Apple Support
5 Things to Know About the iOS 15.4.1 Update
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I've used iOS 15 on an iPhone 6S – here's how it compares to the iPhone 13 Pro experience | TechRadar
iPhone 7 review: how good can a phone be if the battery doesn't even last a day? | iPhone 7 | The Guardian
Amazon.com: Battery for iPhone 6s, [Upgraded] 3200mAh High Capacity New 0 Cycle Replacement Battery with Complete Repair Tool Kit for A1633 A1688 A1700 : Cell Phones & Accessories
Run, don't walk, to replace your iPhone battery for $29 - The Washington Post
Apple confirms iPhones with older batteries will take hits in performance - The Verge