Introduction
There are only a few steps that you need to take in order to replace the batteries.
Tools
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            First, completely loosen the 9.6 mm Phillips #2 screw on top. There is a plastic washer that holds the screw to the top cover, so it will not need to be taken out. 
 
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            Completely loosen the 9.6 mm Phillips #2 screw from the battery cover. Once again, there is a plastic washer to hold the screw to the cover. 
 
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            Lift the battery cover to gain access to the batteries. 
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            Replace the 3 AA batteries and reverse the steps to put everything back together. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.