Amazon.com: HQRP AC Adapter Works with iRobot Roomba 531 533 536 537 551 561 563 564 571 577 578 600 611 790; 800/880 Series [Vacuum Cleaning Robot]; 80501 APS #80701 Power Cord Replacement : Electronics
Amazon.com: Synergy Digital Vacuum Cleaner Battery, Works with iRobot Roomba 531 Vacuum Cleaner, (Ni-MH, 14.4, 2800mAh) Ultra High Capacity Battery : Home & Kitchen
iRobot ROOMBA 531 | MALL.SK
iRobot Roomba 531 - YouTube
Robot | Roomba 531 | Robotics Today
roomba 531 products for sale | eBay
Woot! Refurbished Roomba 530 for $130 | TechCrunch
HQRP AC Adapter for iRobot Roomba 531 533 536 537 551 561 563 564 571 577 578 600 611 790; 800 / 880 Series [Vacuum Cleaning Robot]; 80501 APS #80701 Power Cord Replacement + Coaster
I have this old 531 that doesn't want to turn on : r/roomba