The battery is in the tender. Your model was made in 2004. That was the time of the change over from 5V to 3V boards. The original sound file for that engine shows it was for a 5V board so I believe that is what you have unless it was upgraded to a 3V system. Just open the tender and see what you have. The 5V requires a 8.4 volt rechargeable battery (looks like a 9 volt). You will get different opinions on using a BCR. I like the BCR in a 3V system, but am not fond of putting one in a 5V system because of the age of the boards.
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