Replacing High-Score Batteries

8-Bit

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So I recently acquired a Punch-Out!! machine that I'm in the process of restoring. The game PCB has a battery pack on it that I assume is used for retaining the high-score list. The batteries that are in there look fine, but I want to replace them anyway, and maybe wire in a remote pack to prevent leak damage in the future.

The issue is that I don't want to lose the high scores that are already on the machine. The manual doesn't seem say anything about the subject. Can I turn on the machine, swap out the batteries and be set?

Thanks
 
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