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I installed a Dallee sound in my first SD45.  Like you, I had to splice wires with various connectors on each end to get things to work.  For sound batteries, I used 8-AA 2300mah NIMH cells in a RadioShack holder. I did not hook up the charging circuit.   The URL below shows pics and a thread I posted that is located in the MLS archives.  


There are more pics in the thread above.

Hope this helps some.
Jim C.
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