During Apple’s keynote event, last Tuesday in Cupertino, Apple summed up many of the features of its new products in huge tiled slides. The features were too many to properly go through each of them, and time was limited. One notable exception was battery life, a key point that graduated to its own little time slot in SVP Phil Schiller’s presentation of the new iPhone Pro.  
The iPhone 11 Pro 5,8” will last 4 hours more than its direct predecessor, the iPhone XS. Its larger sibling, the iPhone 11 Pro Max, gains an additional 5 hours.
That’s certainly the result of a number of factors: better power management by the new A13 Bionic chip, software enhancements, and - we suppose - a larger battery. 
Apple hasn’t confirmed the actual mAh value of the iPhone Pros’ batteries yet, but size and weight of the new iPhone 11 Pros suggests that the capacities have been improved quite significantly.  For the first time in years, in fact, Apple has forgone its usual pursuit of thinness and lightness and accepted that consumer care way more about how long their phone stays alive, rather than how thin and light it is. The iPhone 11 Pro and the iPhone 11 Pro Max are now 8.1mm deep, which makes them 0.4mm thicker that the iPhone XS and XS Max, while they weight respectively 11 and 18 grams more than their predecessors. There’s another pro to the Pro’s bulkier build: the camera module is now sunk a little bit more into the phone’s body. It’s not completely flush yet, but that’s certainly an improvement over the double camera on last year’s iPhones.