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I updated my phone to iOS 113 and when I check the battery health it shows that it is 85. Kind of weird that my iPhone 7s battery went from 85 in iOS 11 to 88 after I installed iOS 12 shrugs. Ios 14 Battery Drain Issue Tips To Improve Battery Life On Iphone Igeeksblog Iphones For Sale Iphone Iphone Battery Life I imagine this doesnt abode well for battery health. Iphone battery health 85 . It is based on full charge cycles and is rated at 500 full charge cycles to 80. Heres how to find out using a feature called iPhone Battery Health. 100 do it before the promotion ends. After 2 years my phone usually has a few better battery health than my wife who uses her phone a lot more but she doesnt let it run out till it. Have you also checked battery health at full charge. I havent really noticed any difference in battery life since the battery was replaced. IPhone Battery Health Explained. Although certain things could cause your battery and phone to malfunction such as