iRobot Roomba Series 500, 600, 700, 800, and R3 Battery
Amazon.com: 1800LI Replacement Parts Battery for iRobot Roomba 985/980/960/600/700/800 Series Robots 614/615/640/652/665/670/671/675/677/680/685/690/695/790/780/770/760/700/801/805/850/860/877/890/891/895 : Home & Kitchen
Replacement Battery For iRobot Roomba 500 Series 600 700 800 780 650 14.4V 3.0AH | eBay
Amazon.com: iRobot Roomba Authentic Replacement Parts - XLife Extended Life Battery - Compatible with Roomba 400 600 700 800 Series Robots : Home & Kitchen
Original Replacement Battery 14.4v 3000mah For Irobot Roomba 800 600 500 700 Series Vacuum Cleaner 510 655 760 880 536 561 610 - Mobile Phone Batteries - AliExpress
How To Remove and Install Battery | Roomba® 800 series | iRobot® - YouTube