Stop in for a cup of coffee

Green eye?
Remember those?
Must have been one of the first sealed batteries. I didn't like the idea, but my Nova had one it and it lasted and lasted.
We have a local person who for years (40) has done nothing but rebuilt alternators. The cost to do mine is $40.
I don't know the history of mine, and wonder if I should just get it done??
I know several people who have used this person and all were very happy with the service.