XS Power makes batteries and capacitors engineered for the demands of high-output audio and electronics systems, and Audio Express Inc in Longview, Washington stocks their products for customers whose builds require more from their electrical system than a factory battery can deliver. Running multiple amplifiers, a large subwoofer system, or extensive lighting can strain a stock battery and alternator. XS Power gives our technicians a solution that supports those loads reliably, protecting the rest of the vehicle's electrical system in the process. If your build is serious, your power foundation should be too.