I must admit: I get irrationally anxious if my iPhone battery hits 75% or below. I plug it in the moment I get to work- and it stays there, unless I'm popping out to pick-up a coffee or headed to a meeting. I make my husband bring his own charger, when we travel. I plug my phone in while I'm waiting to board a plane. Maybe I need to invest in Everpurse? Contained within a cute pocketbook is a charger designed to keep your smartphone juiced all day. Genius.