My DIY iPhone Battery Replacement Was Easy. Here's What I Did. - CNET
Amazon.com: WAVYPO Battery for iPhone 6 Plus, Upgraded 4500mAh High Capacity New 0 Cycle Battery Replacement for iPhone 6P A1522 A1524 A1593 with Full Repair Tools and Adhesive Strips Kit : Cell
How to Replace the Battery on the iPhone 6 - YouTube
Will Apple replace the battery on this iPhone 6S although there is a tiny crack on the bottom left corner? Or will they refuse and demand the display to be replaced beforehand? :
iPhone 6 Battery Removal - YouTube
How to Remove Battery from iPhone 6 or 6 Plus
iFixit selling $30 iPhone battery replacement kits through 2019 after Apple ends discount program for official repairs - 9to5Mac
iPhone 6 Plus Teardown: Twice as Big a Battery as iPhone 5s [Update: 1 GB RAM Confirmed] - MacRumors
Apple iPhone 6s Plus Teardown Reveals Slight Battery Downgrade | HotHardware