How long to charge a car battery ?

Discussion in 'Off Topic' started by NightCrawler, Jan 1, 2005.

  1. NightCrawler

    NightCrawler Diamond Member

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    The battery was dead for awhile and the charger is a 10 amp battery charger.

    I charged it for 4-5 hours or so but it still won't crank the car over. The lights work and everything but not enough cold cranking amps.


    The battery wasn't fully charged yet but I removed it because I really needed to move the car.


    PS: This is a HUGE battery.
     
  2. MazerRackham

    MazerRackham Diamond Member

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    Chearge it for 2004502! HAPPY HENA:SLK YEARAS!
     
  3. SharkySimo

    SharkySimo Member

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    Depends on the battery.... MOST car batteries charge for no less than 12 hours.
     
  4. Aimster

    Aimster Lifer

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    Mine takes 35 minutes .... you sure you have it connected on properly and the key turned one?
    (I turn the car on with it connected)
     
  5. amdskip

    amdskip Lifer

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    Yeah, does it have a setting for cranking it over? I would just let it charge overnight and try it in the morning. The setting should be something like boost for starting it but don't fry the thing with it.
     
  6. Goosemaster

    Goosemaster Lifer

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    Find the metal bar that holds the battery in palce. Remove both bolts. Remove battery .Reattach. Done.
     
  7. MrYAK

    MrYAK Senior member

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    You could also do the old jump start method. Have a friend pull up in front of you hook up the jumpers(remember, connect both pos. and neg. on their car, connect the pos. to the batt. and the neg. to the frame of yer car) only have their car running, turn the key to the run position, turn every thing you can on, this will get juice running through the battery, wait......then try it. this has always worked for me if i need a jump. once you got the car running, leave it on for a while so the alternater can charge the battery.
     
  8. Goosemaster

    Goosemaster Lifer

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    Sometimes, if the battery is dead, you'll still have to leave it charging for a bit.

    Either way, if you are cranking the thing, make sure a running vehicle is attached by the batteries or you will suck the life out of your bat and jsut waste time if it is being problematic.

    Also, there is no sense in earing down your starter. In fact, your electronics might heat up or whatever, so let it charge up, and don;t crank it for extended periods of time. I only mention thisbecause one of my relays heats up like crazy makign the car dead weight until it cools. I would think that this might be a universal problem for older automobieles, but promise nothing.
     
  9. olds

    olds Elite Member

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    It's possible that the battery is ruined and can't accept enough of a charge to start the car. What is the specific gravity of the electrolyte?
     
  10. DrPizza

    DrPizza Administrator Elite Member Goat Whisperer
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    Jumpstart car... drive to Autozone... have them check the battery to see if it's dead or just needs to be charged up.
     
  11. NightCrawler

    NightCrawler Diamond Member

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    I'm using a neighbors old Kmart 10 amp car charger, he bought 20 years ago. The battery was completely dead. After 4-5 hours it was back to life some in that the lights were lighting up.

    {{{{ I wrote this at 2 AM but fell asleep til 6:45 AM so it's a little late getting posted }}}}
     
  12. Goosemaster

    Goosemaster Lifer

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    :thumbsup:
     
  13. flot

    flot Diamond Member

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    10 amps for 4-5 hours should be plenty.
     
  14. NightCrawler

    NightCrawler Diamond Member

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    Dead Battery.....way to start the new year.
     
  15. Zenmervolt

    Zenmervolt Supermoderator<br>The Garage<br>Elite member

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    Might not be possible with newer sealed batteries.

    ZV
     
  16. olds

    olds Elite Member

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    True. Where does it say it was sealed? I must have skimmed by it.
     
  17. The Stigenator

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    well the 10amph charger will take a minimum of 12-24hrs to fully charge. If its got a meter on teh charger see that its taking the full charge, as it charges it will drop in amps used.. when its down to a level where its charged you can start it.

    10amps/hr * # of hrs = amps charged..

    edit:

    my motorcycle battery is a 10amp battery. When dead it will take 10 hrs at 1amp to charge. My charger does not have a 1amp setting, it has a 10 amp and a 2 amp. I put it in 2 amp and its usually fully charged around 3-4 hrs. That's because i usually have some charge in there already.

    If i am in a hurry on that battery, i put it in 10amps, wait about 20 minutes, and its usually done.
     
  18. redly

    redly Golden Member

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    charge time is dependant on a few variables...temperature being an important on that comes to mind. IIRC, with Lead Acid batteries, the efficiency of the charge cycle goes way down as the temperature gets below 32F. If at all possible, get your car to a warm garage if you want to do a full charge
     
  19. d33pt

    d33pt Diamond Member

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    your battery may just be toast where it won't hold enough charge to be useful anymore. if it's been sitting dead for more than a day or two, it probably is junk..