6800mAh Lithium Battery for iRobot Roomba 500 600 700 800 900 620 650 595 890 US | eBay
Amazon.com: 14.4V 3200mAh i7 Battery Replacement for iRobot Roomba e and i Series, Large Capacity Battery Compatible with Roomba i7 i7+ i8 i6 i4 i4+ i3 i3+ i7158 J7 7150 7550 and