To test the transferability of our conclusions above with regard to functional performance, we extended our study to two electrolyte solvent molecules with substitution, -CH 3 and -F (PC and FEC). Given the comparatively cheaper cost and good performance of DLPNO-CCSD(T) with respect to CCSD(T), we select DLPNO-CCSD(T) as the reference to compare the performance of different density functionals. Our detailed numerical results are given in the SI (SI-2 and SI-3), but, unsurprisingly, the findings are very similar to those for EC, reinforcing our previous conclusions. Specifically, B3LYP-D3, M06-2X-D3, CAM-B3LYP-D3, and the double-hybrids are the best performing functionals within their respective rungs.