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
How to Remove and Replace Battery on iRobot Roomba i-Series - YouTube
How To Remove and Install Battery | Roomba® 800 series | iRobot® - YouTube
Roomba® i7+ Robot Vacuum Cleaner with Clean Base® | iRobot®