[Finnster]

Redoing packs isn't that hard, but it can still be a pain, and potentially dangerous if you ar not careful. You can do it a variety of ways, either remove all the batt shrink off and apply new, or just cut the end and tape/shrink it again. If you really want to keep the label, you can cut it out and tape it on top, or even reuse shrink and tape over slice down the side.

Best way is to use all new shrink.

The ends are usually covered w/ tape and maybe foam or cardboard to protect the tabs. You have to take this off too. This is where you have to be careful. Don't short the pack, and best to cover all the other tabs w/ tape while you solder on one. Last thing you want is a tool or wire sliding and touching two tabs, blammo! Put everythig back on in reverse.

For what you are doing, I wouldn't take the pack apart, just trim the wires back and splice on your new wire. Two cuts and two soldering jobs and you are done.