DOCK ONLY NO CHARGER Roomba iRobot Discovery 400 Series Robotic Vacuum Home Base | eBay
14.4V Vacuum Replacement for iRobot Roomba 400 Series Robotics - MightyMaxBattery
Amazon.com - iRobot Self-Charging Home Base 4931 (Compatible with iRobot Dirt Dog, iRobot Roomba 400 Series and Discovery Series) - Robotic Intelligent Vacuums