Apple will replace your iPhone 6, 6s, or 7 battery for $29 even if it's not being throttled
Amazon.com: SHENMZ Upgrade Battery for iPhone 6S, [3200mAh] Conqto 2023 New Version 0 Cycle Ultra High Capacity Battery Replacement for iPhone 6S Model A1633,A1688,A1700, No Tools : Cell Phones & Accessories
DIY iPhone 6 Battery Replacement - Very Easy! - YouTube
I got my iPhone's battery replaced, and I'm angry Apple didn't tell me to sooner - The Verge
iPhone 6S Plus Battery Replacement | Elite iPhone Repair
iPhone 6S Replacement OEM Battery
Got iPhone 6S battery problems? Here's how to get your iPhone 6S battery replaced | TechRadar