Mobile USB battery pack includes one USB port for conveniently charging iPods, PDAs, cameras and other personal electronics when no other power source is available. The battery pack itself can be charged either from a standard wall outlet, using its AC power cord, or with DC power via its USB cable, offering up to 55 hours of service. The USB cable is dual purpose: for charging the battery pack or for charging electronic equipment and is compatible with USB2.0 and USB 1.1. The compact design of this unit allows it to be easily stowed and carried for travel convenience. A lifetime warranty ensures that this battery pack is free of defects in design, assembly, material or workmanship.