adding a second battery

Discussion in 'Electrical Stuff' started by YBW0S0, Jun 9, 2018.

  1. YBW0S0

    YBW0S0 New Member

    5
    Feb 20, 2011
    Tampa, Fl
    180 BR SEA RAY - BOAT & MOTORS CLEARWATER FL
    MERCRUISER WITH ALPHA ONE
    Where can I place a second battery to my 1999 Sea Ray 180 BR. Seems I don't have enough room to place it next to the other one. Any ideas? And also how do I go about it?
     
  2. Wylie_Tunes

    Wylie_Tunes Active Member

    485
    Oct 26, 2012
    Lake Wylie NC area
    N/A
    N/A
    What if you turn the existing one 90*? Done that in a couple cases.
     
  3. JVM225

    JVM225 Well-Known Member

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    If it’s set up anything like my kids 2005 180 Maxum Bow Rider then there is no easy way to do it. There battery is on the starboard side behind a seat back. You’ve got to maneuver it through a cut out in the fiberglass to get it in there. Once in, the trim pump, steering cable, and battery take up all the real estate.
    The port side space behind the seat is taken up completely with the gas tank.
    I’ve come to the conclusion that the easiest thing to do is to get one of those small jump packs for them to keep in the glove box or under a bow cushion so they will have it if they kill the battery.
     
  4. capn mike

    capn mike New Member

    7
    Jun 9, 2018
    Gulfstar 50
    Yanmar 4JH4-TE
    If you're simply trying to increase the storage capacity of the battery, you might want to consider replacing your lead battery with a lithium ion battery that is about the same physical size. It will have much more capacity.

    Here's a couple options:
    This one is 100 Ah and not very big - only 28 pounds.
    https://www.lithiumbatterypower.com/collections/frontpage/products/12v-100ah-lithium-battery
    This one is 150 Ah and a little bigger, but still only 50 pounds. That's still probably lighter than the lead battery you currently have and it is definitely a lot more amp-hours.
    https://www.lithiumion-batteries.co...n-batteries/12v-150ah-lithium-ion-battery.php

    The main drawback is of course the price. But keep in mind these batteries will last much longer than a typical lead battery.
     
  5. BillK2632

    BillK2632 Well-Known Member SILVER Sponsor

    Jun 25, 2009
    Lake Norman, NC
    1999 185 Bowrider,
    Mercruiser 4.3, Alpha I
    In my 185, the batteries are on opposite sides in the storage area on either side of the engine. I have the rear sunpad configuration, not the two jump seats on either side of the engine.
     
  6. YBW0S0

    YBW0S0 New Member

    5
    Feb 20, 2011
    Tampa, Fl
    180 BR SEA RAY - BOAT & MOTORS CLEARWATER FL
    MERCRUISER WITH ALPHA ONE
    I like your idea, but first I'm going to see if it is possible to add the second battery and place it underneath the starboard seat (I do believe it is the bait well, I don't used it ) and from there run the cables a short distance to the switch and main battery. If it gets to difficult I'm going with jump pack Thanks!
     
  7. YBW0S0

    YBW0S0 New Member

    5
    Feb 20, 2011
    Tampa, Fl
    180 BR SEA RAY - BOAT & MOTORS CLEARWATER FL
    MERCRUISER WITH ALPHA ONE
    Not much room at all and the surface is not even. Ithink I'm going to try to place the battery underneath the starboard seat cushion (bait well I do not used it) and run the cables to the other battery and switch. I may have to somehow raise the cushion a bit with a couple pieces of 1x2 wood strip molding, that will give me enough clearance....is either that or buy a jump pack and keep it for emergency. Thanks again
     
  8. Boater420

    Boater420 Well-Known Member

    Mar 11, 2015
    Clearwater, FL
    '97 330 Sundancer
    V-Drives
    Westerbeke 4.5BCG
    Twin Merc 454's
    Wow, had no idea they were that expensive! They'd have to last 10 times longer than a lead acid battery to recoup that price.
     
  9. Wylie_Tunes

    Wylie_Tunes Active Member

    485
    Oct 26, 2012
    Lake Wylie NC area
    N/A
    N/A
    Go with an AGM and turn it on its side.
     
  10. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Google for lithium jump starter or battery pack.
     
  11. JVM225

    JVM225 Well-Known Member

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    My kids little boat has the well under the starboard seat too.
    The two problems I see:
    1. If the boat has the battery on the starboard side (like my kid’s does) you’d be adding the weight of the second battery to that side. Doesn’t take much weight to make that little boat list to one side and there are no trim tabs to level it out.
    2. The second battery needs to be vented. You could overcome this by using AGM batteries, but they get pricey and you’ll likely still have to open that space up to fit the second battery.
     
    YBW0S0 likes this.

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