As I am saying in the title I have limited time to make a decision because I have a coupon from mophie for 10% off that expires in 48 hours. I am going to get a battery case for my iPhone 6s and can't decide between getting a mophie or the iPhone smart battery case. Can u guys help me to make a decision before my code expires. I was thinking about getting the juice pack ultra- the biggest one. Please give me your opinions if you own any Battery Case or not.