Here is how to find out if your iPhone 6s is eligible for a free battery replacement
Amazon.com: Upgraded Battery for iPhone 6S, (2023 New Version) [3200mAh] Battery Replacement for iPhone 6S A1633,A1688,A1700 with Complete Professional Repair Tool : Cell Phones & Accessories
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Apple iPhone 6s Battery Replacement Kit with Tools, Video Instructions, Extended Life Battery and Full One Year Warranty - Walmart.com
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iPhone 6S Battery Replacement with Free Toolkit (1715 mAh Li-ion Battery) | Ramjet.com
Amazon.com: EMNT 4000 mAh Battery Compatible with iPhone 6s High Capacity A1633/A1688/A1700 Battery Replacement 【New Version】 with Repair Tool Kits and Instructions【2 Years Warranty】. : Cell Phones & Accessories
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iPhone 6 Battery Replacement with Free Toolkit (1810 mAh Li-ion Battery) | Ramjet.com