I was a little low on cash in pocket last winter (just gotta love direct deposit ) and needed a cranking battery so I dropped by Advanc Auto and picked up a small, cheap marine cranking battery for my 'lil 50. Hadnt had a minute's problem YET.
I dont troll much but do night fish alot and I use two of the biggest Walmart yellow marine batteries hooked in parallel to run all my lights with and am well pleased. Nary a problem for the past 2 & 1/2 years so far. I guess the best trolling battery I ever owned came from Bass Pro (with their name on it). Spent almost a hundred on it back in '97, which was alot back then compared to cheaper marine batteries, but that dang battery lasted 7 years and it was solely for trolling. If they werent so far away that is what I'd own now (if they still carry that same one).
Health nuts are going to feel stupid someday, lying in hospitals dying of nothing.