I have my answer . after conversing with 2 people from my stim company
( other companies/makers may be different...) both a medtronic Rep and patients service agent told me No. the lead may migrate, move or it may wear out and they will replace that lead . the battery gets replaced like I knew already. So unless there is a problem or issue the whole stim wont wear out all at once and the wire going from my battery to my lead wont need any messing with..Unless I have trauma or accident that causes issues ...
I like that answer and hearing it 2 times from 2 different people is good.
okay I can get back to other things now.
PEACE
BMW