So here's one way of making some sort of connector for the battery with the two poles separated. A piece of a larger heat shrink with glue inside that I pinched in the middle before I heated it with the heat gun. Once it cooled down, the middle is glued together and keeps the two sides separated. To answer how well this heat shrink with glue in it sticks to stuff, well it sticks really well. It is very hard to take off and you actually have to rip it off bit by bit by completely destroying it.
