Free apps drain smartphone energy on 'advertising modules'
A first-of-its kind study from Purdue University in Indiana proves that up to 75 percent of your phone's energy is used to power the advertising that litters free apps. Most of this power is put toward running "advertisement modules" which are used to download adds or pinpoint your location.
Purdue researchers have also invented a new tool called eprof, or energy profiler, to map out how much energy each app is spending on advertisement modules. Applications are built on thousands of lines of code which are then broken down into subroutines, threads and processes. Eprof then analyzes how much each component uses.
Inefficient power usage was most prevalent in apps that used devices already built into the phone, like the GPS tracker, the compass or the camera light.