iRobot Roomba - How to Remove the Battery - YouTube
iRobot Roomba 655 Pet Series Battery Replacement - iFixit Repair Guide
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