6800mAH Battery for iRobot J7 J7+ i6 i7 i8 i6+ i7+ i8+ Robot Vacuum Will it make a HUGE Difference? - YouTube
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