You charge battery pack with mini usb. After it's charged you attach it to back of case by magnet. Awkward to hold with pack attached. What it does charge is minimal on phone. Don't think it will charge it completely. After a week I gave up on the battery pack. Kept using the case but after a month it started splitting at the seams. Would not recommend
Not what I was looking for. I was thinking it was a mophie case with a built in battery, maybe just me and didn't read the description correctly. Works great for when I'm at home but too bulky with back up battery on the case to carry around