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Battery Question

XafXaf Posts: 1,132 Officer
I have a sealed 12V marine deep cycle battery that I use for deep dropping with my electric reel.  Ninety nine + percent of the time it sits in my garage on a battery saver (smart trickle charger).  My question is,  "What should the life expectancy of the battery be under these conditions?"  I don't want to go offshore some day and find that the battery is dead and won't hold a charge.


  • The Cat's EyeThe Cat's Eye Posts: 1,661 Captain
    edited May 12 #2
    Garages are not good places to store lead acid batteries. Battery life is reduced at higher temperatures. This holds true for ANY type of lead-acid battery, whether sealed, Gel, AGM, industrial or whatever.
    Some authorities say that for every 15 degrees above 77 degress F. battery life is cut in half.  

  • XafXaf Posts: 1,132 Officer
    I'm not too concerned about the heat in the garage.  I'm not sure why but my current garage gets warm but not hot even in the middle of August/September. The garage at my previous home would get so hot I could not stand to work in it even with fans blowing. 
  • The Cat's EyeThe Cat's Eye Posts: 1,661 Captain
    edited May 13 #4
    My two car garage hits 90 plus degrees all summer long.  Probably due to the fact that my garage door faces south. If your garage door faces some other direction other then south it would be cooler then mine.  But the plus side of my garage facing south is that my roof covered patio faces north and is cooler for that reason then if it faced south. (Which is one of the reasons i choose my lot for building the house)
  • Kokosing LoverKokosing Lover Posts: 1,140 Officer
    My garage door faces north, and the interior temp punches right through 90 degrees every day of the summer.  It's also an unfinished garage with no insulation and no shade over the roof, which I think is the main driver for the high temps.
  • lemaymiamilemaymiami Posts: 4,633 Captain
    Two to three years is your battery's lifespan - longer than that can be achieved by careful maintenance.  As far as your garage is concerned you can also insulate the inside of a garage door (something I'm planning on doing when I replace my garage door this spring (double garage, east facing door...).  Back to your battery.. If in doubt place a proper charger on it the week before a planned trip (at least a six amp charger, a 10 amp would be quicker...) and if it doesn't charge up completely you're needing a replacement.  Whenever I keep a battery on my garage floor I always place it on a piece of wood -never on the concrete floor directly.  I was advised, many years ago that a battery can discharge into concrete, don't know if that's true but have never wanted to find out... 

    I've also considered a mini-split A/C unit just for my garage since it's my workshop as well as where my skiff sits and it does get cooking if I don't have the garage door and side door wide open when I'm working there (tying flies, making lures, building and repairing fishing rods, reels, etc.).  Add to that the much needed maintenance on my guide skiff (Use a boat hard and something always needs fixing...) and over the years I've often considered a stand alone A/C unit for my garage... just to keep it reasonable... 
    Tight Lines
    Bob LeMay
    (954) 435-5666
  • XafXaf Posts: 1,132 Officer
    edited May 15 #7
    Lemay, I agree on the battery discharging through concrete.  After experimenting years ago I now store my battery on a short piece of  2" X 6".  I just completed a small kitchenette. bathroom and game room addition and added a mini-split unit. I am amazed how well it works.

    Back to the battery, it is already 4 - 5 years old and is still going strong, which is one reason I posed the original question.  I guess as long as it takes a charge and the battery conditioner indicates that it is good I'll continue using it.   

  • lemaymiamilemaymiami Posts: 4,633 Captain
    At that age your batt is doing great.   As much as I use and keep charging all of my batts I'm lucky to get three years out of them (standard wet cell batteries, 2- group 27 batts (for my trolling motor) and one group 24 - my starting and house battery... 
    Tight Lines
    Bob LeMay
    (954) 435-5666
  • The Cat's EyeThe Cat's Eye Posts: 1,661 Captain
    edited May 17 #9
    By using a large window fan positioned on the floor at the propped open house door, i can lower the tempetature in my garage by ten degrees to about 80 degrees F in the summer months. i also made cardboard inserts to block the screened openings that are at the bottom of the garage door. I only do this if i need to work for an extended period of time in the summer months. Works even better at night.
  • TarponatorTarponator Under a BridgePosts: 18,564 AG
    edited May 16 #10
    The following doesn't apply much to batteries, which seem to last only two or three seasons no matter what I do, but I thought I'd mention it anyway:

    You might consider a dehumidifier in your garages instead of an AC.

    It's not really the heat that causes problems, IMO, but rather the humidity in combination with the heat, and a dehumidifier is typically easier to install and cheaper to buy and run.

  • CaptjamesCaptjames Pompano BeachPosts: 216 Deckhand
    Get a cheap load tester and load test the battery before going out. 
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