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8D battery replacement

Discussion in 'Engines' started by Dan balmer, Feb 9, 2023.

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  1. Capt Ralph, Feb 11, 2023
    #21
    Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    12,727
    Location:
    Satsuma, FL
    Yes, Lets get back to the 4-71. More fun there.

    Also, lets bow to the OP, Dan who's back can still think about moving any battery.
    Young backs R&R'd those TelCom batteries (6) for me.
    My back did not hurt a bit that night.
  2. cleanslate, Feb 12, 2023
    #22
    cleanslate

    cleanslate Senior Member

    Joined:
    May 29, 2018
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    1,652
    Location:
    Cherry Hill, NJ
    Thanks Burgermeister..:) . Good information. I like the weight difference and the longevity. But after comparing things, the 8D has more of everything CCA,Ah, etc.
    Again, on my small vessel the two batteries power everything. The house, the motors, the generator etc. I am hesitant to change things up.
    Also mine are not to hard to remove. The both rest between the motors in a built in battery box. Straight shot down from the salon floor above. I tie a rope to each grab handle and my wife and I each handle one end of the battery together to lower and raise it. I also use a 2 x 8 plank to slide it up and down the steps and as a gang walk onto the boat aft deck.
    It’s still is something I do not look forward to.
  3. ranger58sb, Feb 12, 2023
    #23
    ranger58sb

    ranger58sb Senior member

    Joined:
    Aug 20, 2013
    Messages:
    823
    Location:
    Chesapeake Bay, USA
    Yes, not much to physically check, no watering. That's one of the reasons I generally prefer AGMs too... although they're not magic and not without their issues depending on how some folks -- especially cruisers who don't often visit a dock -- recharge (or not).

    "Same battery charger" depends on your starting point. It's a matter of matching what the charger can do compared to what the battery wants. You can get the Lifeline manual (for instance) and see exactly what voltages they recommend. Then you can compare that to voltages you charger can supply (sometimes depending on settings).

    Some chargers have only basic settings (FLA/AGM, Gel), and the rudimentary settings may or may not match your battery requirements. Some newer chargers give you several different "profile" options and even a way to select exact bulk/absorption and float voltages, easier to match charger and batteries.

    Lifeline, for instance, actually recommends lower bulk/absorption and especially float voltage than Odyssey... and then Lifeline tends to offer higher capacity in their 8Ds, while Odyssey emphasizes cranking amps.

    (We had banks of 3x Odyssey Extreme G31s before, dual purpose start/house architecture, got 11 and 12 seasons out of those banks. This boat is setup for 8Ds instead, ditto dual-purpose architecture, and came to us with run-of-the-mill wet batteries with one bank in a difficult location for service... so I'm gradually switching to Lifeline 8Ds... with acceptable cranking amps but also slightly higher capacity than the Odyssey equivalent.)

    -Chris
  4. Dan balmer, Feb 17, 2023
    #24
    Dan balmer

    Dan balmer Member

    Joined:
    Jun 20, 2016
    Messages:
    75
    Location:
    Port Canaveral,fla
    Thanks so much for all the discussion on battery choice for the boat. It was very informative. I have decided to try 2 wet cell 31’s for the starboard engine 24v starting of big diesel. 1000 cranking amps. Started engine easily. Weigh 80#. Easy lifting. No battery box shift and unbolting needed to remove or install. $130 ea. will see how this goes this season before replacing the other engine set which is due next season. Thanks Ralph for all the technical information on this kind of thing. My house battery system is 5yr old 2@8d starting battery s that I suspect needs replacement at this time. Will keep an eye on it. Can get to these easily. Any recommendations?
  5. Capt Ralph, Feb 17, 2023
    #25
    Capt Ralph

    Capt Ralph Senior Member

    Joined:
    Sep 8, 2004
    Messages:
    12,727
    Location:
    Satsuma, FL
    If your gen-set is always running, not much house battery is really needed.
    But if you anchor out, the gen-set off, extended life batteries (high & deep cycle) are to shop for.
    For the house and electronics, this is where the AGMs really shine thru.
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