This is why I have ordered the external battery, and have decided to anchor Astro, because you can charge up to 6 times the iPhone and the iPad up to 2 times. (Self-tested and properly rated)
I subtract a star for one reason, because I own an iPhone 5 and no suitable connection for this lies, and I have to take my old charger cable. Since I am pure Apple users is also a USB port for Android superfluous for me, what I consider to be not so bad. Also the price is very fair.