I installed a Garmin 126 with livescope and am running it off the starting battery with a direct feed to the front of the boat. It is holding up ok but was thinking of changing to a group 31 AGM battery. Has anyone tried this as it looks like there may not be enough room for the extra inch of wide of the 31 versus the 27 size that is in it. Also will the factory charger handle an AGM battery.