I finally received my watch today (42mm Space Gray!) really liking it after a half day of use! Very slick, still learning some of the UI but I did I have one question. This may seem silly but I'm so used to keeping up with closing apps on my iPhone that I feel like I should be doing the same on the watch. I'm guessing I'm incorrect since I can't find any literature on that being necessary. I'm used to closing an app to save battery on my iPhone.