Smartphones with long battery

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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.

Smartphones are the  Knives of the tech world

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 six smartphones with battery usage that really impressed us, whether it was because they scored well in 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.

Motorola Droid Razr Maxx -15 hours and 16 minutes

HTC Evo 4G LTE -10 hours and 13 minutes

Samsung Galaxy S III -9 hours and 24 minutes 

Motorola Droid 4 - 9 hours and 5 minutes

Motorola Photon Q 4G LTE -8 hours and 6 minutes

Sony Xperia Ion - 7 hours and 57 minutes