NSM Performer Grand (CD) control unit question

I am working on a NSM Performer grand that is giving a battery error code, I can't find a source for a replacement battery (loks like a chip really) So I may have to replace the control unit. This particular one is marked as a 206631B. I found one that looks just like it but it is a 206631C, will the difference in part numbers make a difference? I will include a pic f the one in the jukebox now.

Thanks

I can't see any battery in the pix, but generally speaking if the number is the same, the code letter, designates a later version---, which should interchange--- Ron Rich

Supposedly the component at IC3 is the battery-Dallas chip in question

If the new one "plugs in" the same way--I would chance it--
Ron Rich

Hi
these ram batteries are available on ebay UK, just need to know what ES system the jukebox is,
Clones

What do you mean by ES system? How would I check?

Hi Its Electronic system, i would say yours is esIV or esV, check your model against the archive list of machines on the jbw.de website
clones

I'm pretty sure that's an ES-IV board. It has the same basic part number as my NSM Galaxy CD and it's an ES-IV system.

-Jim