Most CMOS/RTC batteries have a standard connector type, however after exhausting tons of time searching I cannot seem to find the type of connector these use.
It's a 2 pin connector with 1.25mm pitch. It reminds me of a JST type connector however it's not that, and I've also search to see if it was apart of any molex mini series. Pictures for reference:
I'm looking for connector B in this picture, connector A seems to be a JST-SH 1.0mm pitch.