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How to revive dead car battery?

Discussion in 'Electronic Repair' started by harore, Sep 17, 2007.

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  1. harore

    harore Guest

    Hello..

    I hope this post is related to this group because I think this is
    about electronic a little bit.

    Hmm, my car battery is almost dead. But, when I jumpstart it, it
    starts well and the battery is also okay for another 2-3 start after
    running it a while. Then, the next morning the car battery is flat
    out. So, is there any method for me to revive the dead battery?
    Because I think it is not fully dead yet, if I throw it, it would not
    be good to the environment.

    Thanks.

    harore
    http://www.hobbyelectroniccircuits.com
     
  2. JR North

    JR North Guest

    It may have a shorted cell, which will cause the others to discharge
    into it. If so, it's junk. Buy a cheap 4 ball hydrometer at the local
    parts deal. A shorted cell will show no balls(whatever...)while a low
    cell will float a couple-3. If all cells float some, it's still savable,
    and prolly just sulfated. You can sometimes cure this for a while by
    deep charging for several hours with a powerful charger, that can pump
    30-40 amps continuous. A trickle charger won't work. Check the water
    level also. If the level is below the plate tops, this will also cause
    failure. I've gotten a couple more years out of sulfated batteries with
    this method.
    JR
     
  3. JANA

    JANA Guest

    After a number of years, usually about 4 to 5 years, the plates inside of
    the car battery get eaten away from the acid, and the electrical activity.
    The fix is to replace the battery.

    --

    JANA
    _____


    Hello..

    I hope this post is related to this group because I think this is
    about electronic a little bit.

    Hmm, my car battery is almost dead. But, when I jumpstart it, it
    starts well and the battery is also okay for another 2-3 start after
    running it a while. Then, the next morning the car battery is flat
    out. So, is there any method for me to revive the dead battery?
    Because I think it is not fully dead yet, if I throw it, it would not
    be good to the environment.

    Thanks.

    harore
    http://www.hobbyelectroniccircuits.com
     
  4. Yukio YANO

    Yukio YANO Guest

    Sounds more like a shorted diode in the alternator or a light or a
    device of some sort is not shut down overnight. I would measure the
    current draw on the battery with everything shut down. Only a few
    milliamps is normal, battery backup for computer memory, anything more
    like an amp or more means a light is on somewhere, more than that would
    be a Shorted Diode in the alternator.

    Yukio Yano
     
  5. Arfa Daily

    Arfa Daily Guest

    Usually when batteries fail like this, it's getting to be towards the end of
    the line for them. For sure, they can sometimes be 'rescued' by the
    sulphation reversal techniques and so on that have been proposed, but with
    winter coming on, do you really want to risk being out in the middle of
    nowhere, with a dead battery ? My last one failed after showing no signs at
    all, and after having just started the engine 10 minutes before without so
    much as a squeak of complaint, so I would take your symptoms as a sign of
    impending failure. Do the test of how much current is being drawn with
    everything 'off', as Yukio suggests, and if that is ok, just go ahead and
    replace the battery. There is no need to have any concern about the
    environment if you dispose of it at a proper centre, as there is a very
    robust recycling initiative in place for them in most countries.

    Arfa
     
  6. A shorted cell won't discharge the rest of the battery.

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  7. Jim Yanik

    Jim Yanik Guest

    There is no
    In the US,most places that sell new car batteries accept old batteries for
    recycling,and they usually have an extra charge if you DONT return the old
    battery,as an incentive to not dump it.
     
  8. Many places that replace car batteries will test your battery and
    charging system for free or for a small fee.
    It's worth the time to make sure a new battery wwon't be killed by a
    faulty alternator.
     
  9. vey

    vey Guest

    I know this is going to sound dumb, but I had this problem once and when
    I took it to a mechanic, it turned out to be a loose alternator belt. He
    told me that and I didn't believe it and said so. The belt wasn't making
    any noise and didn't slipping belts squeal?

    He tightened it up and told me, "Look, I won't charge you anything. You
    drive it this way for a week and if it doesn't work, you don't owe me
    anything, but if it does, you owe me $10." I went back a week later and
    paid him.
     
  10. Jim Yanik

    Jim Yanik Guest

    that is one courageous mechanic.

    Returning and keeping such an honest man on your side is a wise
    choice,though.
     
  11. Charles

    Charles Guest

    If it is 5 years or older, replace it. Plate sulfation and high-resistance
    internal connections are common after 5 years or so.

    Other problems to be investigated: slipping belts and a defective
    alternator.

    Car batteries should be recycled. Please be kind to our planet since we are
    sort of stuck here for the moment.
     
  12. Charles

    Charles Guest

    Good idea. Depending on where one lives, they can go longer ... but there
    is no substitute for reliability!
     
  13. Meat Plow

    Meat Plow Guest

    I replace mine after 5 years regardless.
     
  14. James Sweet

    James Sweet Guest


    First check your charging system, if that's working ok, replace the battery.
    There's no way to restore it that will get you anything approaching reliable
    performance from it.
     
  15. philo

    philo Guest

    With the exception of giving a sulfated battery a good charge...
    there is no practical way to revive a battery.

    However"

    The battery is not necessarily bad...
    the problem could be your alternator.

    With the engine running, measure the voltage on the battery...
    it should be approx 13.5 - 14 volts.

    If it's under 13 volts...get it to a repair shop and have the alternator
    checked.

    However, if the voltage is OK then the battery is either bad...
    or else there is a current drain somewhere.

    You could try disconnecting the battery overnight to test that.


    BTW: If it turns out that the alternator was bad...
    if the battery is not that old...once the car has been driven for a while
    and the battery is re-charged properly...
    it will be "revived".
     
  16. vey

    vey Guest

    Long since dead, I'm afraid. They don't make 'em like they used to.
     
  17. Guest

    I had a pair of Die Hards in my truck for 17 years. They were
    manufactured in 1980 though. Finally failed 10 years ago. They really
    don't make them like that any more.... Lenny
     
  18. mm

    mm Guest

    Good advice. I knew how to fix cars, and just went to Sears to buy a
    battery. I had just gotten the car from my brother and this was my
    first step in fixing a long term problem. They said, Do you want our
    Free two thousand thirty-five point multicheck? I figured why not.

    They confirmed I needed the battery and found a bad connection, a
    dirty one, where the + battery cable connected to the starter
    solenoid.

    The car was 3 years old and my brother had bought it new. The dealer
    had, they said, replaced the starter, the battery, and the alternator
    each twice, but never found the problem. Then after 2 years, they told
    him his warranty had expired. Sears found it in 5 minutes.

    It wasn't the end of my problems, but it was a good start. Whenever I
    left the lights on for a few hours after turning off the car, the
    connection would go bad. At first I took off the cable, used a knife
    to clean the parts, and tightened it up again. Eventually I learned
    to stick my arm under the car and just move the cable around the bolt
    a little bit. Once I was on my way to a date and the car stalled and
    woudln't start just as I was getting on to Lake Shore Drive. In my
    good clothes had it started in about 15 seconds without getting
    anything dirty but my hand a little bit.

    This was a 65 Catalina. The 67 Catalina didn't have this problem even
    when the lights were left on. Maybe I should have replaced the
    battery cable. maybe there was something strange about it. Or even
    the solenoid, but that's more work and money. Once I only had to
    wiggle it

    If you are inclined to email me
    for some reason, remove NOPSAM :)
     
  19. mm

    mm Guest

    In addition to waht they said, a short term remedy is to disconect one
    pole of the battery every night.

    Besides a lightbulb that is on all the tiem, you could have sonar in
    your burglar alarm, and once I accidentally installed two burglar
    alarms. The second made a difference, and ran the battery down efveyr
    night. It was an old battery, but even if it were new, it's not good
    for the battery to run it down everynight.

    My first car, a 50 Olds, had a dead battery, adn all I had was a cord
    that plugged into the wall, a lightbulb socket with lightbulb, and an
    icepick. Even that would have been plenty, but just as I was about to
    find the problem, I would get something out of the glove compartement
    and shut the door well. On the way up, when I was almost "to the
    top", I would get something else out of the glove box and shut the
    door badly. Took extra hours but I found it, and bent the door a
    little and all was well.


    If you are inclined to email me
    for some reason, remove NOPSAM :)
     
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