Duracell Powerpack 450... The Duracell Powerpack 450 is a stand-alone source of portable power for AC, DC and USB-powered electronics such as a laptop, cordless or cell phone, GPS, lamp, portable light, small tool and small appliance. Simply connect your devices to the Powerpack 450 and its voice technology automatically tells you the estimated runtime for each device. The Duracell Powerpack 450 is a great companion during a power outage. It is a quiet, safe, indoor power source and a good complement to a generator. It will operate and charge important electronics so you can stay connected to your family, news and weather reports. Make the Duracell Powerpack 450 a part of your vehicle emergency kit. Its voice technology will talk you through how to use its vehicle jump starter and air compressor features, which makes these tasks less stressful during an emergency.