http://www.cio.com/article/703714/Free_Apps_Kill_Smartphone_Battery_Life?page=1&taxonomyId=3067
Network World — Those free apps like Angry Birds, Instagram and Tiny Wings may be loads of fun, but they suck the battery life out of your smartphone by tracking your geographical location, sending information about you to advertisers and downloading ads.
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The researchers findings show that 65% to 75% of the energy used to run free apps is spent for advertising-related functions. The free Angry Birds app, for example, was shown to consume about 75% of its power running "advertisement modules" in the software code and only about 25% for actually playing the game. The modules perform marketing functions such as sharing user information and downloading ads, according to the researchers.
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"A particular source of power inefficiency is a phenomenon called 'tails.' In principle, after an application sends information to the Internet, the 'networking unit' that allows the phone to connect to the Internet should go to a lower power state within a fraction of a second. However, researchers found that after the advertising-related modules finish using the network, the networking unit continues draining power for about seven seconds. The tails are a phenomenon of several smartphone hardware components, including 3G, or third-generation wireless systems, GPS and Wi-Fi, not flaws within the app software itself. However, software developers could sidestep the problem by modifying apps to minimize the effect of tails," Hu said.
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Today, energy is the single most important factor plaguing smartphones. Modern smartphones come with faster processors, latest sensors, incredible screen resolutions, faster network connectivity, and as such these factors together contribute to the ability of the smartphone to consume energy at much faster rate than the ability to produce/store energy, i.e., the battery capacity. For example, the CPU performance over the last 15 years has grown by 246 times while the battery energy density has only doubled during the same period," wrote Abhinav Pathak, a Purdue doctoral student who was part of the research team.
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