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.