Ditto on the jump start battery
Never felt the need to have two batteries. I have a 20' CC 8cyl boat, maybe on a bigger boat needs them. One fall day went to Wolfeboro and had the heater blanket plugged in. When got back to boat battery was dead. Luckily found a jump start battery. Two key turns and the boat was running. Bought one the next day.
I also bought a "SMART" battery. I attached it to the battery and when I leave for home I hook it up to the outlet I have near the lake. I have a fresh battery when arriving every weekend. This also solves the bilge pump problem. When the battery starts to go low it turns the charger on so you never have a dead battery. Since there's no power outages during boating season, were good. Been doing this for 35 years with no issues.
Dave M
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