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Thread: 2 batteries

  1. #1
    Join Date
    Jun 2008
    Gastonia, NC

    Default 2 batteries

    It seems like a lot of people are running two batteries. One for the stereo and one for starting the boat. I have bought a new starting battery and plan on using the current battery for the radio.

    Question 1: Do you wire them in parallel or series? Seems to me it would be in parrallel to get more amp hours out but not for sure.

    Question 2: I also bought one of the switches that allows you to use battery 1 or battery 2 or both batteries. It seems like a good idea but there is really no good place to mount it for easy access. Do I need this? If I do have this and lets say I have the starting battery at position 1 and the radio battery on position 2. I want to start the boat so I have the switch on position 1. Does that mean I can't have the radio on? Or does that just mean the radio battery wont get charged? And vise versa. If I have the switch on position 2 I won't be able to start the boat or the starting battery just won't get charged? I can leave the switch in the position where both are being accessed and everything works but then what is that really doing for me? I assume both batteries would get drained if I am listening to the radio but then they would both get charged too. But that is no different than if I just wired them up in Parallel.

    Any suggestions?

  2. #2
    Join Date
    Oct 2009
    Pacific NW USA


    Clutch -

    You'll probably get a lot of fancy opinions on this subject but I'll give you a few direct simple answers.

    Battery 1 = starting battery
    Battery 2 = stereo battery
    Battery 3 (if applicable) = Combined with stereo battery bank

    Wire all batteries to the perko switch (or alike) you bought. They have very simple instructions for wiring.

    the strategy is to keep the battery 2 + 3 separate from battery 1 because you dont want to run them all down and not be able to start. Suggest you look at group 27 batteries for all of this. As to which brand.. I wont even go there because there are so many opinions. You'd all probably laugh if I told you my preference.

    Most people get confused by all the battery systems. It's not that hard. It can just get a bit intimidating. PM me if you need more help. It's all good!

    - Brian
    Exile Audio

    PS: sorry I have not been around much these last few weeks. It's been crazy busy at Exile... whoa!

  3. #3
    Join Date
    Jan 2008
    Tallahassee, FL


    Good for you, Brian.
    My Mom said I'm not allowed to get wet!
    2008 LSV
    2000 Outback LS (sold)
    Exile Tunes

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