Hello all, I've been using this site since I bought my first boat back in January and have been thrilled with the info you all post. I'm currently looking at batteries for my trolling motor. I was just wondering what the "Group" number was on batteries. Is it just the physical size of the housing or is there more to it? <br />More relavently...I'm getting the Minn-Kota 68PD Pontoon model motor and don't know which battery size, amperage etc I will need. (Obviously I will need 2)<br /><br />Thanks in advance<br /><br />Hawk