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This is Dr. David
I am sorry about your husband's situation.
it sounds like he has a lot of issues going on.
this question has been studied in research
"In the overall group, the ERI (elective replacement indicator) was reached at 18.9 +/- 3.9 months (mean +/- standard deviation). The time from ERI attainment to generator exchange due to battery depletion was 8.1 +/- 5.1 months, and total battery life was 27.3 +/- 3.1 months"
he should not notice any difference in the way he feels
let me know if you have other questions.