Not able to stop iOs background process

Hello,

I already implement background service for my app. I am using it for getting user current location by using location services.

I will explain the way i implement this - "XYZ.js" - Screen where user distance display. Following code is added to set register background service -

var iService = Ti.App.iOS.registerBackgroundService({
            url : 'BackgroundService.js'
        });

once app go to background, background service start and collect user locations. When app come is at foreground i fired following event -

Ti.App.fireEvent('stopBackgroundService');

In "BackgroundService.js" - there is listener as -

Ti.App.addEventListener('stopBackgroundService',function(){
    Ti.App.currentService.stop();
});

But after finishing this all location base work, when i move to other screen and move app to background location services start again. Which affects device battary.

Any suggestions? Thanks in advance.