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My cranking battery died on me while I was on Lake Washington a while back. I was reminded that I need a good portable cranking battery. If any one has any suggestions of a charger that will start both a truck and boat I would appreciate your suggestions. I will say "Thank You" in advance for your help.
Do your self a favor and get the biggest battery for cranking you can get. Then buy yourself a set of jumper cables instead and keep in the boat. That will solve your issue I bet. The same thing happened to me 3 x when I bought my boat until I upgraded to a larger battery. You can jump off the troller batteries if needed and you don't have to worry about keeping the portable battery charged either. Hope this helps.
I use a big deep cycle battery for starting my boat as it runs everything except trolling motor. Plus got a good set of jumpers cables on board too !