Volvo AWD 850 Forum

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Hot Battery 850

posted by  mickeyc on  Mon Aug 18 10:22 CST 2008
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last visit: Mon Sep 14 14:08 CST 2009
[RELATED]

Hi All,

I have an 94 850 with 170K thats fairly new to me (1 week)
I noticed a burning smell and its coming from
the Battery. I also noticed a slight seepage of acid
coming from the top of the battery. The cables seem fine
...... but the battery is very hot to touch.

I did have the battery out yesterday when dealing with a
headlight washer moter that woulndt turn off.
I removed the wiper moter.
Cables are hooked up correctly.
Any thoughts.

Thanks

Mike









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    Hot Battery 850

    posted by  Ozark Lee on  Mon Aug 18 10:52 CST 2008
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    last visit: Thu Jan 3 22:08 CST 2013
    [RELATED]

    Take the battery to the nearest chain auto parts store and have them test it. They will do it for free and then they will gladly sell you a new battery. The best test is done on the machine with the battery out of the car.

    It sounds like you have a shorted cell in the battery but the test will tell for sure.

    ...Lee








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      Hot Battery 2 850

      posted by  mickeyc on  Mon Aug 18 11:36 CST 2008
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      last visit: Mon Sep 14 14:08 CST 2009
      [RELATED]

      OZ,

      since the posting I was able to find my multimeter.

      Im getting 17-18 volts between the battery posts.

      I did switch the battery with another one. Same test results.

      I'm guessing its overcharging. Do the 850's have an external regulater

      or do I need to swap out the alternator. If this was my 240......

      this job would be done. I'm reel green on the 850's.

      Mike








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        Hot Battery 2 850

        posted by  KlausC on  Mon Aug 18 11:42 CST 2008
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        last visit: Fri Oct 24 10:15 CST 2014
        [RELATED]

        Nice catch, I was going to suggest you need a new regulator. It is supposed to put out around 14.5V. Don't be anywhere near that battery if it gets hot, it can explode. Wear safety glasses and keep a garden hose handy, to wash you first and everything else second.

        IIRC the regulator does come off with the brushes.

        Klaus
        --
        I still miss my 164 and my 854T. Just driving a V70R :)







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