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Anyone run two 6 volt batteries in series for 12 volts?

Discussion in 'The Hokey Ass Message Board' started by firstgear, Mar 10, 2012.

  1. alphabet soup
    Joined: Jan 8, 2011
    Posts: 1,570

    alphabet soup

    '63 caddy used a long thin 12 volt.
  2. japar
    Joined: Jun 30, 2007
    Posts: 263

    from Seekonk Ma

    I have been known to put 2 12s together in a series in the winter to start my diesel. 24v makes that sucker crank! Just don't use the cigarette lighter
  3. MeanGene427
    Joined: Dec 15, 2010
    Posts: 1,945

    from Napa

  4. pasadenahotrod
    Joined: Feb 13, 2007
    Posts: 11,776

    from Texas

    The group size of the long skinny 12V battery is 3EE most commonly used in forklifts. My old T roadster had one in it standing on the rear frame rail inside the abbreviated pickup bed between the "tailgate and the 28 Chevrolet gas tank. Easy to reach, easy to service, easy to remove.
  5. hd4unm
    Joined: Dec 6, 2012
    Posts: 151


    No challenge to pasadenahotrod, but just a point...that may help the OP.

    I'm not a Euro guy but a friend had a '70 Porche 911 with two batts. They were well place in the nose (as many know) on opposite sides. I expect it was engineered that way as ballast/balance and not to add voltage but accommodate what they needed and enhance the car.

    If I had to consider your options... I'd look at all the options and impact; maint. (number of connections, etc.), cost, weight, appearance, what else?
    Personally, one batt is enough for me if it does the job.
  6. Dads426
    Joined: Jul 14, 2010
    Posts: 24

    from Olney, MD

    Your 12-volt battery is really six 2-volt batteries (or cells) wired in series internally. Using two 6-volt batteries is acceptable as long as they are the same type. Very common in solar power systems. I've run 60 2-volt batteries in series for 120 VDC systems.
  7. dan c
    Joined: Jan 30, 2012
    Posts: 2,250

    dan c

    i've heard that the theory behind two 6v batteries is that they provide more cranking power. a buddy had a 59 mga with that setup and the biggest bummer was that the batteries sometimes fell over!
  8. big daddy Raleigh
    Joined: Jul 11, 2008
    Posts: 123

    big daddy Raleigh
    from Denver CO

    You could run two 12v motorcycle batteries in parallel. Wiring batteries in parallel batteries adds the amps- wiring in series adds the voltage.

    Posted using the Full Custom H.A.M.B. App!
  9. 40FordGuy
    Joined: Mar 24, 2008
    Posts: 2,907


    GM did that with the 53 Cadillac Fleetwood "limo" body cars; Worked great.

  10. mike in tucson
    Joined: Aug 11, 2005
    Posts: 504

    mike in tucson
    from Tucson

    How many flashlight batteries placed end to end in a round tube would it take to start a SBC?
  11. Bill Wright
    Joined: Oct 30, 2011
    Posts: 3

    Bill Wright

    I have two 6 volt optima's in my '37 Fordor.
    12 volt's to start and run the electronic ignition on the '39 Merc Flathead.
    This way I can take 6 volts off to run the rest of the accessories.
  12. EZ Cool
    Joined: Nov 17, 2011
    Posts: 261

    EZ Cool
    Alliance Vendor

    My '49 John Deere A model tractor came from the factory like than. It had a 12 volt system before 12 volt batteries were available.
  13. TheTumbleweeds
    Joined: Jul 29, 2010
    Posts: 537

    from Sweden

    koenigsegg uses two 6 volts, to keep weight balance perfect in the chassie

    optima batteries, gel, you can place them any where, even on side and upside down,
    pretty nice to hide ;)

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