All settings were default except: Wi-Fi was associated with a network the Wi-Fi feature Ask to Join Networks was turned off. Talk Time tests were conducted over a 3G voice network. Testing conducted by Apple in August 2014 using preproduction iPhone 6 and iPhone 6 Plus units and software, on both GSM and CDMA carrier networks. Testing conducted by Apple in August 2015 using preproduction iPhone 6 S and iPhone 6 S Plus units and software, on both GSM and CDMA carrier networks.
Testing conducted by Apple in March 2016 using preproduction iPhone SE (1st generation) units and software, on both GSM and CDMA carrier networks.
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All settings were default except: Bluetooth was paired with headphones Wi-Fi was associated with a network the Wi-Fi feature Ask to Join Networks was turned off. Testing conducted by Apple in August 2016 using preproduction iPhone 7 and iPhone 7 Plus units and software, on both GSM and CDMA carrier networks. Testing conducted by Apple in August 2017 using preproduction iPhone 8, iPhone 8 Plus, and iPhone X units and software, on both GSM and CDMA carrier networks. Talk Time tests were conducted over a Voice over LTE (VoLTE) network. Testing conducted by Apple in August 2018 using preproduction iPhone X S, iPhone X S Max, and iPhone X R units and software, on both GSM and CDMA carrier networks. See /batteries and /iphone/compare for more information.
Battery tests are conducted using specific iPhone units. Battery life and charge cycles vary by use and settings. Battery has limited recharge cycles and may eventually need to be replaced by an Apple authorized service provider.
All battery claims depend on the cellular network, location, signal strength, feature configuration, usage, and many other factors actual results will vary.