We finally know exactly what size Apple's iPhone 7 and iPhone 7 Plus batteries are
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
iPhone Battery and Performance - Apple Support
Apple iPhone 12 Pro Max packs 3,687 mAh battery, smaller than the 3,969 mAh cell on iPhone 11 Pro Max
Battery Life - The iPhone 12 & 12 Pro Review: New Design and Diminishing Returns
APPLE Original iPhone 8 Plus Battery 2691 mAh Internal Battery & Tool Kit New | eBay