As you know that there is not “close” button in Android apps this doesn’t mean that they shut down or close when you return to home page or move to another app. All of your leaving apps like calendar, note pad, messaging, FM radio etc. are running in background data which drains your battery power. The default process of closing app is not simple.
You need to go to setting > Applications > (wait for list to load….) > Select app > Force Stop to completely close running apps.
Advance Task Killer Stop Background Apps To Save Battery:
The alternative and easy way to stop background is Advance Task Killer. By using Advance task killer app you can easily stop all your unrequired apps process with just one click. You will be amazed to see in Advance Task Killer that there are many app run on startup without your knowledge. All you have needed to do is that open this Task Killer and take a look at the running applications list? Uncheck some apps you don’t want to kill (such as Advance Task Killer and some system apps) Tap the button ‘Kill selected apps’, it will kill all required applications checked. You can easily use it a couple of times through the day. In setting menu there are many customized features available like you can build your own ignore list, auto kill level, auto start and security level. The interface of app is simple and easy to use.