S95 can fit? I saw the battery holding pan, one of the edge of S95 size battery will likely sit on the lip of the battery pan, at a slightly slanted position.
Headlight moisture will go off within a month.

This car is well known for less than optimal insulation compared to competitors, hence the road and tyre noise, need to live with it. Or if you have money to spare, can consult those accessory shop to apply additional insulation.