Use this Apple tool to check if your iPhone 6S is eligible for a new battery | ZDNET
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iPhone 6s Battery: Replacement Part / Repair Kit
Amazon.com: High Capacity Compatible with iPhone 6S Plus (5.5") Battery Replacement, Upgraded Battery for iPhone 6S Plus A1634 A1687 A1699 with Professional Repair Tools Set : Cell Phones & Accessories
iPhone Battery Replacement in Chicago | Cell N Comp Repairs
Apple updates iPhone battery replacement prices for 2019 - Neowin