Advanced Power System (APS) 3000 mAh NiMH Battery. You can buy directly from iRobot (Item Number: 17373)or on Amazon ($20 buck cheaper). Be sure and get the NMh battery and not NiCad . The old one is probably blue and the new one will be yellow. The new model will last almost twice as long. Please rate this answer by checking on the hands below.
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Advanced Power System (APS) 3000 mAh NiMH Battery. You can buy directly from iRobot (Item Number: 17373) or on Amazon ($20 buck cheaper). Be sure and get the NMh battery and not NiCad . The old one is probably blue and the new one will be yellow. The new model will last almost twice as long. Please rate this answer by checking on the hands below.