3200mAh 14.4V Lithium Ion Replacement Battery for iRobot Roomba i7+ 7150 7550 i3+ 3550 i4 4150 Robot Vacuum - Walmart.com
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Batmax i7E5 Rechargeable Battery for iRobot Roomba Vacuum Cleaner i series i7 i7+ i7550 i7558 and e series e5 e6 ABL D1|Rechargeable Batteries| - AliExpress
PowerTrust 2600mAh i7E5 Li ion Battery for iRobot Roomba Vacuum Cleaner e series e5 e6 and i series i7 i7+ i7550 i7558 ABL D1|Rechargeable Batteries| - AliExpress
iRobot Roomba i7+ review: smarter than the average robot vacuum - The Verge