I really don’t know a whole lot about batteries accept that they make my accessories work when hooked up correctly.
So I assume that the 31 group will give me a longer run time (trolling motor) or longer periods between charges versus the 27 group and the 29 would be some place in between? Is this the only reason or is there more? Does a 12 volt versus a 24 volt versus 36 volt motor make any difference as to the group size?
I have read several times on IDO to buy the largest battery possible (31 or 29)that will fit and can afford, but why?