Terrible! Doesn't fit and keeps falling out. Because of this, Roomba keeps stopping. I bought it to replace the one that came with the car because my son took it and hid it. Luckily I found it and put it back in. No more stops! If you need a new one, buy one from iRobot or another brand. (One star because I made a choice, otherwise I would have left this field blank.)
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