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There are 9 volt Nimh rechargeable batteries available. they should work good for this application. Just be carefull to check the voltage. There are some 7.2 v "9volt" batteries and some 8.4 v. The 8.4 volt batteries are the better choice. It should be listed on the label.
I believe that walmart sells a rayovac 8.4 volt "9volt" battery.
John
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