For iPhone 6s Battery 1715mAh Replacement Internal Adhesive Tape + Tool Kit US | eBay
Here is how to find out if your iPhone 6s is eligible for a free battery replacement
Amazon.com: Battery for iPhone 6S, (2023 New Version) High Capacity Upgraded New 0 Cycle Battery Replacement for iPhone 6S with Repair Tools Kits : Cell Phones & Accessories