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 6s, max capacity 81% and battery still dies in 1 hour, bad battery? Grandma owned phone since it was bought new. : r/mobilerepair
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