In reply to jonnie3430:
> Oh no, my book has broken, and my GPS, for heaven's sake it's my camera now, what'll I do? Meh.
> Turn off data, or put on flight mode and it'll last a week.
I think you're missing Dave's point - the point is that when you use your "camera" or "gps" all day and run the battery out - you have no emergency contact ability anymore. With separate items, there is no need to worry that using your camera will cause your ability to call emergency services to be impacted.