Can a Marine Battery be too big?

Discussion in 'Electrical Systems' started by HartfordDan, Aug 1, 2006.

  1. HartfordDan
    Joined: Aug 2006
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    HartfordDan New Member

    The marine battery that came with my 140 hp MercCruiser engine had 600 CCA when I bought the boat used (1986 Sea Ray Seville 19'). About three years ago I replaced that battery with a slightly smaller Sears Marine battery ( I think it had 550 CCA ). The battery holds a charge but I don't think I'm getting enough amps to start the engine every time. Would it be okay to use a marine battery with 625 or 650 CCA's ?
  2. Jason Connellee
    Joined: Jul 2006
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    Location: Maryland

    Jason Connellee Junior Member

    Yes. Hope this helps.
  3. Ike
    Joined: Apr 2006
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    Location: Washington

    Ike Senior Member

    Buy as large a CCA rating as you can afford. Typically people add various things to their boats such as radios, depth finders, gps and so on and soon that 600 CCA battery is no longer adequate.
  4. marshmat
    Joined: Apr 2005
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    Location: Ontario

    marshmat Senior Member

    A big battery can always power small loads. A small battery can't power big loads though. Buy the highest rated battery you can afford, that still fits in your battery box.
  5. stonebreaker
    Joined: May 2006
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    stonebreaker Senior Member

    Did you check all your connections yet, load test the battery, etc. etc.? Or are you just starting to try and figure out what's wrong?

  6. danstar
    Joined: Oct 2006
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    Location: LV

    danstar New Member

    alternator may be too small

    and thus your battery may be undercharged

    what kind of charging device do you have ?
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