For me, it's piece of mind. Over the past month or so that I've had the phone, I've ended up having the phone die on me three times at the end of the day on the way home from work (I work long hours and have an hour drive each way). If something were to happen to me on the way home, I would like to know that I have battery life left. Not to mention, I really would like to be able to go out after work without the battery dying on me.
I do have a car charger now that I can use if I absolutely have to...but it's nice to not have to go that route.
I do have a car charger now that I can use if I absolutely have to...but it's nice to not have to go that route.