https://www.theverge.com/circuitbreaker/2017/9/14/16307588/iphone-8-plus-battery-size-compared-iphone-7 >The iPhone 8 is incrementally better than the iPhone 7 in every way except one: battery capacity. A listing on China's version of the FCC, TENAA, shows the batteries are being downgraded in the new devices. >The iPhone 8 will have a 1,821mAh battery, compared to the 1,960mAh battery in the iPhone 7. The iPhone 8 Plus will have a 2,675mAh battery, compared to the iPhone 7 Plus' 2,900mAh battery.