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This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?

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Smartphone battery down to 10 percent?

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Time to turn down the brightness on the screen, right?

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It's a classic strategy to squeeze more juice from the battery. And it works.

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But that trick might be less effective than you think.

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Because it turns out nearly half the battery drain on a phone happens when the screen's not even on.

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So says a study presented at a meeting of the Association for Computing Machinery, in Portland, Ore.

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Researchers eavesdropped on the activity of more than 1,500 Android phones, specifically, the Samsung Galaxy S3 and S4.

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And they used an app they developed called eStar Energy Saver.

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The app logs the energy drain of the phone's apps and activities as they happen.

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And you can try out eStar Energy Saver yourself, if you have an Android.

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They found that some 45 percent of the battery drain happened while the screen was off.

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A lot of that energy suck was apps updating in the background,downloading headlines and weather, while you're not actively using them.

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And different versions of the same app require different energy supplies.

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For instance, some versions of the Facebook app were twice as energy thirsty as other versions.

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So app version choice could slow your battery drain.

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But one of the most hidden energy draws, zapping 12 percent of the battery, was just cellular paging:

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the pings from a cell tower every 1.28 seconds, that tell your phone if a call or message is on the way.

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Which is, ultimately, the price of being connected.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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