Here is how to find out if your iPhone 6s is eligible for a free battery replacement
iPhone 6s Battery: Replacement Part / Repair Kit
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iPhone 6S Plus Battery (Original)
OEM Battery for iPhone 6S
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Dantona Lithium-Ion Battery for Apple iPhone 6s CEL-IP6S-HC - Best Buy
iPhone 6 – Battery Life and Verdict Review | Trusted Reviews
Atomic S Battery Case for iPhone 6 Plus / iPhone 6S Plus 5.5″ – [Black / Black]
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Amazon.com: WAVYPO Battery for iPhone 6, 3200mAh Upgraded New Version High Capacity 0 Cycle Replacement Battery for iPhone 6 A1586 A1589 A1549 with Full Replacement Tool Kit Instruction : Cell Phones & Accessories
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Wait! Don't pay the $29 fee to replace your iPhone 6s battery just yet | TechSpot