6 volt batteries are made with a higher cycling capacity to them. This means if you regularly drain your batteries past 50% 6 volt batteries will last longer. The 12 volt batteries are not made to withstand constant cycling and do better when full. 6 volt batteries have a larger capacity as well when compared to 12 volt batteries.
You also get what you pay for. I would never risk my fishing on Costco batteries. Go to Canadian Energy and buy some premium batteries then you wont have to worry about them pooching out on you like a Costco battery will.
I put two 6 volt batteries I bought at Canadian Energy on my trailer over 8 years ago and they are still going strong.......My two cents.
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