In my first battery bank I used copper tube as interconnects. Trojan 105 batteries have a stud terminal so I used half inch tube, hammered flat with a hole for the stud.

It worked but I would not do it that way again. A bit dangerous if you have those big areas of conductor exposed and a wrench or other metal object gets across them.

Again, it works but I would recommend you avoid it for several reasons.

Good luck with it.

Tom

The Truth is the Truth, even if no one believes it; and a lie is a lie even if everyone believes it

Consider using Adhesive Lined Heat Shrink, costs more, keeps the acid from crawling up the tubing.
Now if you can keep if off the terminals then maybe you don't need it.

Drill hold in pipe, not use spade connector. Like Tom said.

**Make sure you coat the terminal end with solder**
want similar metals in contact with each other. No copper and lead mechanical interface.
Soldering it's chemically bonded to the copper. No dissimilar metal interface.

Would 1/4" tube be large enough? I have some of that laying around and have the heat shrink to cover it. Is there anything I can use as adhesive to prevent acid creep? Would shaping the tubes into arcs help in terms of expansion and contraction? At least then the expansion pressure would be downwards.

Such amazing practical info! Thanks for all the lengthy replies!