https://wccftech.com/iphone-11-battery-capacities-other-specifications-digitimes/

A significant info has already been leaked about the upcoming iPhones ranging from their alleged sizes to the camera setup. Earlier, it was also reported that the newer models will pack bigger cells than their predecessors, but exact values were unknown. Fortunately, an industry media outlet has listed what it believes will be the iPhone 11 battery capacities, and we can honestly say that you’ll experience better screen-on time with the newer devices.

The Taiwanese publication DigiTimes (spotted by MacRumors) alleges that the iPhone XS successor, which could be called the iPhone 11 Pro, will sport a 3200mAh battery, which will be a bump of nearly 20 percent over the 2658mAh battery the 2018 model shipped with. The outlet has also estimated the iPhone 11 battery capacities for the two other models, claiming that the iPhone XS Max’s followup device will have a 3500mAh cell, a 10 percent increase over the 3174mAh capacity battery of the current generation variant.