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I am a "2 battery type guy" but I would save the weight and go with one. There are posts and articles on wiring and if you want to isolate your electronics, a manual switch just for them would suffice. Click it off just when you are starting and then back on again. Starting will not affect navigation lights, bilges, etc... I have a "fixed" vhf (fixed is a misname, I remove mine from the mount and the other wires are set up to easily disconnect) as well as a hand held. Hand held's are inexpensive and having two devices is a nice safety feature aside from weather. Others are more knowledgeable about kickers.

Enjoy your boat and welcome.

Garris