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1 .This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?
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2 .Smartphone battery down to 10 percent?
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3 .Time to turn down the brightness on the screen, right?
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4 .It's a classic strategy to squeeze more juice from the battery. And it works.
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5 .But that trick might be less effective than you think.
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6 .Because it turns out nearly half the battery drain on a phone happens when the screen's not even on.
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7 .So says a study presented at a meeting of the Association for Computing Machinery, in Portland, Ore.
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8 .Researchers eavesdropped on the activity of more than 1,500 Android phones, specifically, the Samsung Galaxy S3 and S4.
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9 .And they used an app they developed called eStar Energy Saver.
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10 .The app logs the energy drain of the phone's apps and activities as they happen.
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11 .And you can try out eStar Energy Saver yourself, if you have an Android.
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12 .They found that some 45 percent of the battery drain happened while the screen was off.
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13 .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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14 .And different versions of the same app require different energy supplies.
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15 .For instance, some versions of the Facebook app were twice as energy thirsty as other versions.
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16 .So app version choice could slow your battery drain.
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17 .But one of the most hidden energy draws, zapping 12 percent of the battery, was just cellular paging:
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18 .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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19 .Which is, ultimately, the price of being connected.
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20 .Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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