14.4V Li-ion Battery for iRobot Roomba 500 600 650 700 800 595 620 Series 6.8Ah | eBay
Synergy Digital Vacuum Cleaner Battery, Works with iRobot Roomba 531 Vacuum Cleaner, (Ni-MH, 14.4V, 4000 mAh) Ultra High Capacity, Compatible with Auto Cleaner 11702 Battery - Walmart.com
Best Replacement Batteries for iRobot Roomba Vacuum Cleaner in 2018