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Extra Battery

I have a 2008 Sun Deck 2400 with a 250 Yamaha 4-stroke.    It came with one battery, but there is a second battery holder and cables.   It also has a rotary dial switch that can be turned to one of 4 positions: A or B or Both or Off.    My dealer told me that the extra battery is for a trolling motor (which I do not have).  However, it occurs to me that the space for the extra battery is just that - an extra battery.   Does anyone know if i can simply put another battery in, hook it up and have a reserve if needed?    Thank You!