Ironman Powerbank The Power Bank is a high capacity, aesthetically beautiful, portable power supply. The Power Bank has 2 usb input ports so two devices can be charged at the same time! This is unique to the Power Bank - no other portable power supply/battery supports dual charging. The high capacity, 5200mAh Polymer Lithium-Ion battery provides a huge amount of portable charge - enough, for example, to charge an iPhone 4 from empty up to 5 times! And it does this whilst maintaing a slim, sleek, ultra-portable design.