The last thing you want is for your phone to run out of juice when you need it most.
Usually, a handset lasts a full work day with moderate use. But if you use them heavily, you'll find you need to recharge it more often. Batteries also lose steam over time, running down faster the longer you've owned it. The specter of losing battery -- and therefore losing your communication hub -- is frightening and real.
If you feel your smartphone battery seems to be stuck in the '90s and doesn't last as long as you'd like, you're not alone. So if long-life battery tops your list of smartphone needs, check out these top-scorers in CNET's continuous video tests.
Editors' note: This post updates frequently. It was originally published October 31, 2011.
The Moto X Play features a customizeable waterproof design, a sharp 5.5-inch screen and a nimble 21-megapixel camera. But the real icing on top is that its 3,630mAh battery lasted about 15.75 hours in our lab tests -- an impressive feat for any device. (Unfortunately, however, US customers won't be able to purchase the Moto X Play. Moto offers the Moto X Pure Edition instead, which doesn't have as much of a stellar battery life as the X Play.) Read the full review.
As the reigning top-of-the-line Android phablet (or big-screen smartphone), the stylus-wielding Note 5 is expensive. But it has premium hardware, including a 1,440p display, an octa-core processor and a 16-megapixel camera. Its battery also lasted 15 hours during our tests, which should appease some users who aren't too fond of the fact that it's nonremovable as well. Read the full review.
Not all long-lasting devices are big-screen phones. The Volt, which has a 4.7-inch display, is a compact and inexpensive prepaid handset that lasted an impressive 16.35 hours during our battery tests. And while its screen and its hardware is entry-level, its battery is at least swappable (though we don't think you'll need to do switch it out so much). Read the full review.
The Galaxy S6 Active isn't just tougher on the outside than your average bear. Its 16.8-hour average performance in three video loop tests caused a couple of double-takes. In addition, built-in wireless charging and several battery-saving modes give phone owners other options for either topping-up or conserving previous power. Read the full review.
If you can stomach this budget phablet's minor drawbacks, you'll appreciate its 16.61 hours' worth of video playback time, according to CNET's lab-run tests. That embedded 3,200mAh battery helps power up the 6-inch display, a notorious slayer of battery life. Still, we'd keep that screen auto-dimmed if we were you. Read the full review.