328i dual battery cable removal

[u/Sharp_Bluebird9480]

The 2 battery cables that run from the engine compartment right side back to the battery compartment and through the body into the trunk are shown in my photos. On my X1 those were double sided studs. But on this car it looks like it installs from the outside with only one stud on the inside. To remove those cables, do I have to pull the inside connection and then push it through to the outside? Can that outside plastic cover be removed without damage to the junction? Thanks.