04 Elantra Battery Smoking

Discussion in 'Hyundai Elantra / Lantra' started by Rob, May 10, 2007.

  1. Rob

    Rob Guest

    My daughters Elantra's battery was smoking, it is dead now. She had it
    jumped off last night but it did not charge the battery. Anyone know what
    could make the battery smoke?

    Rob
     
    Rob, May 10, 2007
    #1

  2. Something shorted. Could be the battery internally, could be some other
    circuitry. I hope you disconnected it to be safe.
     
    Edwin Pawlowski, May 10, 2007
    #2
  3. Rob

    Steve R. Guest

    I concur with Ed. More than likely a shoert within the battery...


    Steve
     
    Steve R., May 10, 2007
    #3
  4. Rob

    Bob Guest

    A single cell can short - sometimes without any visible effects. What then
    happens when you start the car - again, a battery with a single, hard
    shorted cell can sometimes still start a car - is that the charging system
    is now charging a 10 volt battery instead of a 12 volt battery. The normal ~
    14 volts usually gets divided among six cells - each with a charge voltage
    of 2.33 volts - now gets 2.8 volts across it. This results in heat - lots of
    it. You basically get boiling sulphuric acid.
     
    Bob, May 10, 2007
    #4
  5. Rob

    hyundaitech Guest

    Your alternator could be overcharging as well. If the voltage is not in
    the range of 13.5 to 15.5V with the engine running, check the main slow
    blow fuse. If it's blown, replace it. If not, look to replace the
    alternator. Either way, you'll probably need a new battery. It sounds
    like it's smoked. (Pun intended).
     
    hyundaitech, May 11, 2007
    #5
  6. Rob

    Tom Guest

    Lucky as heck it didn't blow up with Hydrogen gas being given off in that
    smoke!!! I wonder how much sulphuric acid is spread all over the engine
    compartment. It might pay to wash everything down with a weak solution of
    baking soda and water. If you see if bubbling, you know it's neutralizing
    the acid.
     
    Tom, May 11, 2007
    #6
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