(stock photo) http://www.target.com/p/mophie-juice...FRGi4AodrREApQ
I bought this brand new, used it once, put it in my desk drawer and forgot it existed. These apparently have a 500 recharge cycle lifespan when new. Mine has 499.
I don't have the box but it'll come with the USB to mini USB cable that it came with. There's a ton of knockoff versions that'll slowly kill your phone. This one is real.
$40 shipped, conus