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The correct procedure for sizing car battery?

Discussion in 'The Hokey Ass Message Board' started by 52HardTop, Mar 3, 2009.

  1. 52HardTop
    Joined: Jun 21, 2007
    Posts: 1,114

    52HardTop
    Member

    Anyone have the info for sizing a battery for a new project? Maybe a web sight that will help? Would hate to have something too small because I was to cheap to spend the money for the right battery. I would be thankful for any direction.
    Dom
     
  2. gearsforguts
    Joined: Sep 18, 2005
    Posts: 436

    gearsforguts
    Member
    from temple,pa

    the more cca the better
     
  3. overkillphil
    Joined: Aug 31, 2007
    Posts: 303

    overkillphil
    Member

    What are you running? Motor? Electrical? What do you have for space? All are factors in finding a battery. If you go with a standard lead-acid battery, I'd suggest getting one manufactured by Johnson Controls. I've been in the auto parts business for a while, and they make a pretty good product. As a rule, go for the biggest, highest CCA battery that will fit.
     
  4. 52HardTop
    Joined: Jun 21, 2007
    Posts: 1,114

    52HardTop
    Member

    Hey phil, it's a 350 crate motor. The battery is going in the trunk of my 51 Chevy convertible. So far all the usual electrical items except electric doors. But, I will may just do them down the road. The same for an AC unit. It does have an electric pump for the top. I guess I could make this easy and just go with the largest cold crank amp battery. There is plenty of room for it in the trunk. I had a plan to go with the gl*** mat or Optima. Thanks, Dominic
     
  5. Deuce Roadster
    Joined: Sep 8, 2002
    Posts: 9,519

    Deuce Roadster
    Member Emeritus

    If you have plenty of room ... go buy a battery for a new Cadillac DTS. They run all the goodies in a new Caddy ... :)

    By the way ... the stock location for a new Cadillac DTS battery in under the rear seat of the Cadillac. SO ... that battery is designed for a rearward position.

    Replacement would be easier also ... because you know the battery makers/suppliers will be making a 2009 Cadillac battery for a long time.

    .
     
  6. a group 65 should be good. the older gms use group 24.
     
  7. Shifty Shifterton
    Joined: Oct 1, 2006
    Posts: 4,964

    Shifty Shifterton
    Member

    Use what fits, but the small case will be just fine. Been my experience with trunk mounts it's more important what you're using for battery cables.

    What are you using for a case?
    Good luck
     
  8. oilslinger53
    Joined: Apr 17, 2007
    Posts: 2,500

    oilslinger53
    Member
    from covina CA

    measure the space you have, and get the highest cranking amp rated battery you can afford, that will fit in that space
     
  9. overkillphil
    Joined: Aug 31, 2007
    Posts: 303

    overkillphil
    Member

    The caddy dts battery is a H6 group (only 750 CCA) runs about $150. A group 24, 27, or 65 is what I'd suggest(800 CCA and up). Only the 24 will fit in a standard battery box. You have to get a large box for the others. If you are going to store it for any period of time, make sure you disconnect the ground to keep corrosion at bay. Of course, an Optima (or similar mat battery) doesn't produce Sulphuric Acid Vapor (the cause of external corrosion) and aren't prone to internal sulphation either (internal corrosion). It's what I'm running in my T. Hope this helps.
    Overkillphil
     
  10. flynbrian48
    Joined: Mar 10, 2008
    Posts: 8,720

    flynbrian48
    Member

    CCA should equal or exceed the displacement.
     

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