Struggling to make your smartphone battery last the whole day? Paying for your apps might help. Up to 75% of the energy used by free versions of Android apps is spent serving up ads or tracking and uploading user data: running just one app could drain your battery in around 90 minutes. Apps such as Angry Birds, Free Chess and NYTimes only 10 to 30% of the energy was spent powering the apps core function. For example, in Angry Birds only 20% is used to display and run the game, while 45% is spent finding and uploading the user’s location with GPS then downloading location-appropriate ads over a 3G connection.
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