madlabs,
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.
Have fun,
Scott.