Got a nicad battery pack to replace in a small loran set. It has 7
individual cells that are in series hookup by means of thin straps soldered
on tops and bottoms of pair, and wires coming off the pack to a small plug.

The replacement battery pack doesn't have the wires needed, so it looks like
I'm going to have to transfer the ones on the old/bad pack to the new/good
pack.

These wires were soldered onto the positive and negative battery contacts.
The question being how can I do that without damaging the batteries? My old
soldering stuff is too hot to use on these delicate things. So, what do I
go to for this task?