According to a recent study by Purdue University, free ad-supported Android smartphone apps are major battery drains. Third-party advertising consumes as much as 65 to 75 percent of the battery drain coming from an app.
The researchers analyzed the energy use of some free apps including Angry Birds, the Android stock browser, Chess Free, The New York Times, and Mapquest. The third-party ads drain more battery than the app itself, since most of them rotate or swap in and out and the data connection needs to be refreshed on a regular basis.
A simple way to solve this problem is to pay for the premium version of an app, though this is not always a convenient option for your wallet and sometimes there is no premium version available.