IIRC the only Frameworks that have a coin cell in them are the 13-inch 11th-gen Intel ones (i.e. the OG model), and it should be right there staring you in the face as you lift the keyboard. There’s indeed a known design flaw[1] around that cell in that it the laptop isn’t wired to drain its own actual battery instead; an email to support or a look on the forums should allow you to sort things out.

[1] https://guides.frame.work/Guide/RTC+Battery+Substitution+on+...