Amazon.com: 14.4V NiCD Battery for iRobot Roomba 500 600 700 Series - 2 Pack : Electronics
Amazon.com: TNTOR Replacement Battery Compatible with iRobot Roomba i7 e6 7150 7550 e5 e5152 e5154 ABL-D1 e and i Series, 14.4V Lithium Ion Battery : Home & Kitchen
Amazon.com: Tenergy New Extended Life 1000 Cycles 14.4V 3850mAh NiMH Battery for iRobot Roomba 900 800 700 600 500 Series, Vacuum Rechargeable Replacement Batteries, Bonus 4 Side Brushes and 1 Brush Cleaning Tool : Home & Kitchen