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Amazon.com: POWITEC 4500mAh Battery for iRobot Roomba I7 i7158 i7+ 7150 7550 i3 3150 i3+ 3550 i4 4150 i4+ 4552 i6 Replacement Lithium Ion Battery 14.4V : Home & Kitchen
iRobot Roomba i7, i7+, e5, e6 Battery: Replacement Part
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
6800mAH Battery for iRobot J7 J7+ i6 i7 i8 i6+ i7+ i8+ Robot Vacuum Will it make a HUGE Difference? - YouTube