Periodic location in background in iOS9

Question

I'm trying to track location using locationManager in the background every "time interval" when the app is in the background.

Its working great on iOS 8 iPhone 6 - but i keep getting terminated after 2.5 - 3 minutes, by the iOS in iOS 9 iPhone 6s.

My main question is - what can be the difference between iPhone 6 iOS 8 and 6s iOS 9? better watchdog timer for background tasks? if so how can i workaround that?

I sow solutions that includes decrease of accuracy to save battery life instead of time intervals, I don't want that because the user is seeing the location monitoring indication all the time(full arrow).

some of my code -

-(void)initialize
{
    self.locationManager  = [[CLLocationManager alloc]init];
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
    self.locationManager.distanceFilter = 5;
    self.locationManager.delegate = self;

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(addMonitorsBeforeWillTerminate)
                                                 name:UIApplicationWillTerminateNotification
                                               object:nil];

    [[NSNotificationCenter defaultCenter] addObserverForName:UIApplicationDidEnterBackgroundNotification object:nil queue:nil usingBlock:^(NSNotification * _Nonnull note) {
        [[UIApplication sharedApplication]beginBackgroundTaskWithExpirationHandler:nil];
    }];
      [self.locationManager startUpdatingLocation];
    }

thanks

Answer 1

For however struggling with that in the future, the answer came from "technerd" by comment so i turned it in to an answer -

https://github.com/voyage11/Location