CMOS/RTC battery standard connector type?
The 2”wire pair with crimp pin sockets may be easily searched , then compare dwg. Dimensions for polarized tabs and housing then choose mating crimp pin sockets with 2” wires for ease of use.

https://www.digikey.com/products/en/connectors-interconnects/rectangular-connectors-housings/319?keywords=&amp;sort=&amp;pv88=2&amp;pv89=108

D-K , Mouser etc have excellent search filters but connectors like this tend to be unique and IP protected for some time for copy protection. So often 2nd sources are rare. 

I used to specialize in sourcing hard to get high volume connectors and for 500$ MOQ , AUK connectors in TW did a pretty good job.