The Dodge build-up

[Hot Pocket]

I am interested in moving the batteries into the tool box but have a couple question. The main reason for this is so I can get to the front shocks easier and possibly free up so room for a different intake.

Thinking I could build a shelf in my tool box for the batteries but

Do batteries need to stay ventilated?

What would be the proper wire size or what the best way to calculate wire size?

The battery on the jetta is completely buried under some plastic box assy ****. So I'm gonna say no, they don't need to be ventilated, but I could be wrong.

As far as best wire gauge... Get whatever you can afford. 1/0 is probably your best bet, but **** ain't cheap