[macojoe]

i have never seen a need for a deep cycle battery, except for a trolling motor or other high use item. i have used regular battery for everything else, but nothing is of high demand.
but i also use electric reels for cod fishing and have always used a friends deep cycle for that.

so the answer for you is if you are using electric trolling motor, live well all day or electric reels, or other high demand stuff, then yes you need, but if its just everyday stuff then no