I did a write up a week ago about the zero lemon case and though I ended up shedding the case I decided to carry around the juice pack with me. While at the gym doing some cardio on the treadmill I wanted to juice up my device as I planned on going to the local sports bar after my workout. Between how much time it took to go from 69-71 (30 mins though I was watching a youtube video while listening via bt headphones) and having to remember to grab it I begin to wonder was it really worth it. The chances I really need to use my juice pack is a small percentage and the time it takes to get 2% of battery life I can about fully charge plugging it in to the cigarette lighter in my car. So with companies advertising as high as 24000 mAh juice packs my question is are they really worth the investment? How many of you own some sort of juice pack and how often do you use them?