SmartThings staff have said in the forums that The presence sensor has exactly the same behavior whether it’s connected to the network or not. It simply attempts to check in every 30 seconds. That’s the only thing it does. It doesn’t try any harder when it is 5 miles from the hub than it does when it’s 5 feet from the hub. So there shouldn’t be any change in battery life for a presence sensor which spends most of its time away from home. The specific question was previously asked and answered, but you can always check with support as well. Unless something has changed in gen 2.