iPhone 6S review: a very good phone ruined by rubbish battery life | Apple | The Guardian
Exchangeable Battery for iPhone 6S+/6+, iPhone 6S/6?
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 6 Plus Battery Replacement: Guide to Replace the Internal Battery : 12 Steps (with Pictures) - Instructables