iOS 11.0.2 on a nearly two year old iPhone 6S (best battery life I've ever had) : r/ios
iPhone 12 Pro Max Battery Replacement - iFixit Repair Guide
Extend iPhone battery life with these 7 tips and tricks - 9to5Mac
Amazon.com: Battery for iPhone 7, uowlbear 2850mAh Replacement Battery for A1660 A1778 A1779 with Complete Replacement Kits and 2 Set Adhesive Strips -0 Cycle High Capacity Extra 890mAh Power : Cell Phones & Accessories
Why do they disable flashlight at >20% battery? Can't I decide for myself? : r/iphone