This is another high-capacity portable battery, the Portable Energy Station from Satechi. The unit is powered by 5200 mAh (2 amp) 18 Watt Compounded Interconnection Battery, which according to Satechi, is more stable and longer life than lithium batteries. It features a USB port for charging mobile devices and a micro USB port for recharging. The Portable Energy Station equipped with six charging tips, including 30-pin dock connector, micro USB, mini USB, making compatible with most mobile devices including iPhone/iPod/iPad, Kindle, and Android Smartphones/tablets. While charging mobile devices, the portable battery can also be recharged at the same time. Satechi’s 5200mAh Portable Energy Station price is $39.99.