14.4v 3000mah Ni-mh Rechargeable Battery For Irobot Roomba 500 510 520 530 540 550 560 570 580 Vacuum Cleaner Parts - Vacuum Cleaner Parts - AliExpress
Vacuum Battery For iRobot Roomba 4000 Discovery / Dirt Dog - 2 Pack - Walmart.com
Amazon.com: iRobot Roomba Authentic Replacement Parts - XLife Extended Life Battery - Compatible with Roomba 400 600 700 800 Series Robots : Home & Kitchen