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
Amazon.com: iRobot Roomba Authentic Replacement Parts - Lithium Ion Battery for Roomba® e & i Series Robot Vacuums : Home & Kitchen
14.4V NiCD Replacement Battery for iRobot Roomba 80501 - MightyMaxBattery
Roomba® 3300 Lithium Ion Battery | iRobot
iRobot Roomba 500 and 600 Series Vacuum Cleaner 80501 Replacement Battery by Chrome Battery – chromebattery