5300mAh Extended Life Lithium Ion Battery Compatible with iRobot Roomba 500 600 700 800 Series 880 770 650 655 870 760 780 790 645 595 585 561 560 550 531 861 864 866 775 780 - Walmart.com
Roomba 581 Battery - Newegg.com
Roomba 581 Battery
Original Replacement Battery 1800li For Irobot Roomba 600 700 500 800 Series Vacuum Cleaner 80501 620 770 535 660 760 581 880 - Mobile Phone Batteries - AliExpress
Battery For iRobot Roomba 500 series 545 552 562 580 581 582 585 595 - MightyMaxBattery
Cameron Sino 4000mah Battery For Irobot Roomba 614,615,640,652,665,670,671,675,677,680,681,685,690,691,695,696,801,805,850,860 - Digital Batteries - AliExpress