my intend was to show how a stock battery fits in the trunk with a straight forward installation, making live easy.
This is the minus terminal, even as the insulation got a tiny red stripe. The bolt has no + sign, but can be turned by a Phillips screw driver.
As I wrote, this was still under construction, with wires hanging around when I took the pictures. The negative terminals got another connection later.
So finally, the cable points in the other direction, not even coming near it.
You canīt see it well on the pictures, because I had to take them from a lowered position. The optical problem is called is parallax.
Even if you turn the terminals around, there is still some air, about 10 mm are build into the hold down bar to make it fool proof. You can see the the part providing this distance riveted to the bar as it lies on the work bench. Last, the aluminum is heavily anodized, so it does not conduct current. So it really would be hard to do make any contact, at last by accident.
But you are right, I could put some shrink over it to make it look more important and even protect it from any dilettantish try to jump start the car.
The battery is protected by 150 A fuse from a Alfa 147. So even a catastrophic short at the starter is protected. I donīt like cars toasted...
The whole mount is much stronger then the stock one in the engine bay ever was. The owner wanted to keep the spare tire, maximum room in the boot and does not race this car (yet). With a race car the battery belongs into the spare wheel well, as deep as possible.