My last wal mart cranking battery was 4 years old and still kicking but I figured it better to replace then wait till I was miles from the launch and have it go out. All I ever use is to crank motor and running lights and trim and I run at least 3 times a week. As for the troll motor its warranty is 18 months and after that it'l start running out of juice faster so 2 years is max on those.
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