This battery does not take more space than a lighter or a small spray of perfume. I do a lot of walking and I like to use the RunnKeeper application while listening to music, which quickly discharge my Iphone. I slide the battery and USB cable in my pocket or my backpack and it allows me to charge my phone at least once, which is not bad for troubleshooting. My son who always listens to music on his Sagem taking his bus to go to work I was often picnic.
Its design is quite simple and goes everywhere but I still find it pretty and she seems to good enough for a price that is quite reasonable, and in addition is guaranteed 3 years from the date of purchase. So why not use it? (^_^)