With bigger, sharper displays and faster processors, today's smartphones can do just about anything. But all those spiffy new features are absolute power hogs—even some of the best phones can barely last a full day, especially if you're working through a Netflix queue or logging a few miles on Temple Run. If you live in constant fear of that blinking red battery indicator, maybe it's time to trade up for a smartphone that can keep up with your daily needs.

We test nearly every phone from every carrier here at the PCMag Labs, and every phone goes through a round of battery testing. Our base benchmark is continuous talk time, and though we recognize that people use their phones for actual phone calls less and less, it's still a reasonably reliable measure of a phone's endurance relative to competitors. Luckily, most of today's smartphones use cellular radios that sip on power, so we're seeing talk times in excess of 15 hours, which is excellent. We can't always test call time due to carrier limitations on call length, in which case we also test playing back a video until the battery is drained.

The good news is that there are a ton of phones out there that can get most people through most of the day on a single charge. Even better, there are a few options out there that can extend that battery life to two or three days based on usage. A new feature we've also seen in some recent releases is an extended "ultra power saving" mode, which throttles performance and optimizes the display to squeeze out every last minute for your smartphone.

Below you'll find our six favorite endurance champs, each offering at least 15 hours of talk time on a single charge.