I would not recommend a product from Mophie. Their products are absolutely horrible for the iPhone 5. I'm normally a huge supporter of Mophie as well. I'm on my third replacement for the helium, and it's going to soon be a 4th. This case will no longer charge, and I'm started to get extremely annoyed. They've also been charging me $16 per replacement until I snapped and they paid for it all, along with refunded me the money I paid.
I thought I was just having a terrible experience, but my two friends own the Juice pack Air and one of them is on their 2nd replacement, while the other is on their 5th replacement.
I'm honestly amazed and how terrible the build quality is. You'd think with all the time they had before they actually released the product, that they'd be able to get it right.
Save your money.