While multitasking is a great feature in smartphones, having several apps running at the same time can also very quickly drain your battery power. Google Android users are advised to use the back button to quit an application rather than using the home key to ensure a program has closed completely. However, if you forget to do this each time, applications will continue to run in the background, not only draining your battery's juice but also slowing down your smartphone. Here's how to check which applications are running on a Google Android device.
From the Home screen open the Applications menu.
From the apps displayed select Task Manager. Now you'll be presented with a list of applicsations that are running. Select End to close any you do not need, or press End all to close the lot.
Press the back button to exit the Task Manager.