On the verts, where does the battery vent tube route to? Is there any concern about keeping the OEM battery on a maintainer while being stored for the winter under a snug custom-fit cover?

 

No, there is no issue at all with leaving the battery maintainer powered while the car is covered. In fact that is the situation with my F-Type as I write. The battery in your car is or should be an AGM; the vent is not needed strictly speaking, but it is there...not sure where the vent hose ends under the car but likely in the left rear wheel opening.

 

Believe it or not, it vents into the rear bumper cavity.

 

Thanks for the info--good to know.