[Jukebox-list] NSM ES5 / ES5.1 Battery Ram / Time Keeper / IC5 Chip (NSM09) - External Battery?

Does anyone know of a place that’s sells this chip NSM ES5 / ES5.1 Battery Ram / Time Keeper / IC5 Chip (NSM09)” modded with an external battery holder?

I have a second replacement on the way for my Performer Grand but it would be so much nicer is I could just replace the battery when it fails. Often the chips are NOS so the battery is already almost at the end of its life span.

Any help or ideas appreciated.

Thanks.

Peter