Smartphones are the Swiss Army Knives of the tech world.
They're cell phones, music and video players, mobile Web browsers, and personal organizers, among other things. Not surprisingly, all this can take a toll on battery life, and when you depend on your smartphone for so much, the last thing you want is for it to run out of juice when you need it most.
Generally speaking, with moderate use, smartphones can give you a full day's performance before needing to be recharged, but not all gadgets are created equal -- some simply run out of steam early, whereas others will hang in there for the long haul. Here are eight smartphones with battery usage that really impressed us, whether it was because they scored well in our CNET Labs battery tests, or simply because their usage time stood out from the crowd of humdrum cell phone batteries we encountered (and believe us, we encounter a lot). Give one of these devices a try if you're looking for a phone that packs some decent juice.
Droid Razr Maxx HD
Despite its big 4.7-inch HD screen and advanced mobile components, the Droid Razr Maxx HD kept going for 14 hours and 53 minutes on the CNET Labs video battery drain test. That's just shy of what its predecessor, the old Droid Razr Maxx turned in (15 hours and 16 minutes). Read the full review.
HTC Evo 4G LTE
Lasting a long 10 hours and 13 minutes before finally calling it quits, the HTC Evo 4G LTE has the power and stamina to be a worthy successor to Sprint's Evo family. Read the full review.
Motorola Droid Razr HD
Sitting in the middle of Motorola's 2012 line up, the Droid Razr HD demonstrated it doesn't need a Maxx in its name to have a long run time. The phone persevered for a full 9 hours and 37 minutes on the CNET Labs Video playback battery drain test before shutting down. Read the full review.
Motorola Droid Razr Maxx
Equipped with a massive 3,300mAh battery, the Motorola Razr Maxx lasted an incredible 15 hours and 16 minutes on our official video playback test, still the best showing we've seen. It also comes with tons of top-notch features including dual-core processing and 4G LTE. Read the full review.
Samsung Galaxy S III
You can add long battery life to the Samsung's Galaxy S III's already outrageous list of features. The powerful smartphone ran our video test for 9 hours and 24 minutes before shutting down. Read the full review.
Motorola Photon Q 4G LTE
Think of the Motorola Photon Q 4G LTE as a slimmer Droid 4 with a brighter, more colorful screen. It also ran for a healthy 8 hours and 6 minutes on our video test. Read the full review.
If you're curious to see how another smartphone stacks up, check out CNET's cell phone battery life charts.
Editors' note: This post was originally published October 31, 2011, and is updated frequently.