Introduction
When your RCX runs out of battery power, you'll need to put in new batteries.
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            Remove the gray battery cover by lifting from the front (near the IR window). Raise it at an angle and remove it to reveal the green battery compartment. 
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            You can now remove the batteries and insert new ones. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order. The orientation of the gray battery cover doesn't matter.