Correct, the decay is not affected by the amount of charge you've pulled out of the cell. What I meant (and should have expressed more clearly) is that the pac

Correct, the decay is not affected by the amount of charge you've pulled out of the cell. What I meant (and should have expressed more clearly) is that the pacemaker will have some minimum current it needs to be able to draw from the TEG to operate, and after the plutonium has decayed to a certain point it won't be able to source enough current to operate, so the pacemaker will brown out.