iRobot Roomba 599 Li-ion Extended Long Life Replacement Battery
Roomba 610 battery, irobot 610 battery
iRobot Roomba 500 and 600 Series Vacuum Cleaner 80501 Replacement Battery by Chrome Battery – chromebattery
Amazon.com: iRobot Roomba Authentic Replacement Parts - XLife Extended Life Battery - Compatible with Roomba 400 600 700 800 Series Robots : Home & Kitchen