Introduction
This guide is fairly easy. It requires no tools and will only take about 5 minutes.
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            Push in the red, gumdrop-shaped button with your thumb. 
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            While holding in the button, slide the back piece away from the main body of the Roomba. 
 
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            Flip the back piece over in your hand. 
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            Using your other hand, grab the yellow tab and pull it away from the back piece. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.