iRobot Roomba Model 4000 Red Robotic Vacuum Cleaner Tested Working. No battery. | eBay
Roomba Repair - iFixit
MIGHTY MAX BATTERY 14.4v Battery for Roomba Discovery 400 410 418 4000 APS 4905 MAX3471762 - The Home Depot
Amazon.com: T POWER 22V Charger for IRobot Roomba 400 500 600 660 670 700 760 770 780 790 880, 400, 500, 600, 700, 800 Series Vacuum Cleaner Full Range of Sweeping Machines Ac Dc Adapter Power Supply : Electronics