Discussion in 'Announcements & FAQs' started by fatcatone549, Dec 20, 2013.

  1. fatcatone549

    fatcatone549 New Member

    Jun 1, 2011
    1999 express 21.5
    Hi I have a 1999 215 express with a 2011 V 8 small block
    it came with 2 types of battries one DEEP CYCLE and one DUAL PURPOSE .Do I need two different types? And If so which side does which one go ? Thanks Dave
    Last edited: Dec 20, 2013
  2. moparlvr4406

    moparlvr4406 Active Member

    Jun 29, 2011
    Lake Monroe Indiana Fourwinds H29
    1985 340DA Justified Priority II /
    1966 SRV180 Black Beauty
    twin 350hp Crusaders 4.0 Onan /
    Merc 950 SS
    generally the dual purpose is the cranking battery
    the deepcycle is the house battery
  3. Ike

    Ike Member

    Dec 17, 2011
    Pacific Northwest
    1972 Sea Ray SRV 190 I/O
    12 Ft Rowboat
    8 Foot Sailing Dinghy
    Mercruiser 165 6cyl inline GM 250
    And yes you do need two. They serve different purposes and they are constructed differently. The starting battery is designed to release large amounts of current rapidly, and be recharged quickly. But if it is drained down too much it can kill the battery rapidly. Deep cycles on the other hand discharge slowly and can be drawn down to 50% charge and recharged again, but they take much longer to charge. Suppose you have an appliance like a refrigerator you want to run overnight. It will kill a starting battery, but not the deep cycle.

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