Smartphones with the biggest batteries in the world and on U.S. carriers

There are several factors on which a phone's battery life depends. One of them is how the device is used – leaving its screen brightness on "high", playing graphically-intensive games, and using GPS are just some of the activities ideal for draining a battery. But that's just one part of the whole equation. A phone's battery life also depends on how big its battery actually is. Battery capacity is represented in milliamp-hours (mAh) – the bigger the figure is, the better mileage you're likely to get. And seriously, who doesn't want a phone that can last ages between charges?