Join Date: Nov 2006
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Six years is often cited as good battery life, but who really knows. If a battery will take and hold a good charge, and if it can handle the loads you put on it, you are probably good to go, provided that you have two of them and you aren't headed for the high latitudes.
I have a Delco GR 24 in a runabout that went into service before 1990 (You read it right, 1990) Still takes a charge and spins the engine very strongly. Since it is a lake boat, I check it frequently and otherwise leave it alone.