Few days ago, I’ve bought a portable charger for gadgets that allowed me to charge my drained iPhone when I was on the go. After browsing the Internet for similar items, I found this high-capacity aluminum and chrome external charging uni called Touch-Swipe USB Mobile Charge Unit.
The charging unit is easy to use, since you can unlock it and activate it with just a swipe of the finger. It also features a LED indicator that shows the charge level.
The gadget features a (3.7v) 5000mAh battery, and it takes about 3-4 hours to charge the iPhone (or any other gadget).