I've replaced a glued in MacBook Pro battery. It isn't a big deal and very similar to the Framework, except the Framework has mechanical connections (screws and tabs). The battery replacement kit came with everything needed. It didn't come with newly additional capacity because the underlying changes in battery chemistry aren't there. The improvements in battery life mostly come from CPUs with lower TDP.

https://guides.frame.work/Guide/Battery+Replacement+Guide/85...

https://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Retina+Disp...