I have just the stock stereo system in my boat: Single amp, 4 speakers and a sub. I want to add a second battery to my boat just for peace of mind. I don't like to run the radio for over a half hour or so when we are just sitting with the boat off for fear of killing the battery. What would be the simplest way to add a second battery that I could Isolate the radio on it when the boat isn't running so I don't drain down the cranking battery at all. It would be nice if the alternator could still charge up both batteries when we are running too. Although about every third or fourth time out I just throw the battery charger on just to make sure I get a full charge on it. The second battery would also be piece of mind if the cranking battery went bad on me. Thanks.
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