For those with iPhone battery paranoia, the iPower Portable Power Station with speaker can be used with both iPhones 2G and 3G. It has a capacity of 2400mAh, a charging and discharging time of 3 hours, and an input voltage of 4.8 ~ 5.5V with a 500 to 1000mA current. Its current output is 100 to 1000mA with 5.0 to 5.5V. At a weight of 93g and available in black or white, it carries a price of $44.00.