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2005 A8 Flat Battery - Help

Discussion in 'A8/S8 forum' started by Sulli69, Nov 5, 2011.

  1. Sulli69
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    Sulli69 New Member

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    [Nov 5, 2011]
    My mum has an A8 that she doesn't use much. It has ended up with the battery going completely flat. Her key stuck in the ignition, but I managed to get it out with the little button thing. I have tried to jump start it with my powerpack attached to the battery but I am having no luck at all - not sure whether it is too flat or what. I have a small battery charger but it is no good for the 3l V6.
    Before she joins the AA and gets homestart, any suggestions as to how to get it going?
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  3. snapdragon
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    snapdragon New Member

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    [Nov 5, 2011]
    You can jump start it (or charge it for a while) from another car using jump leads, but the -ve lead must be connected to the buzz bar above the battery, not the -ve terminal on he battery. I usually start the donor car and them connected for a few minutes to get a 'surface charge in your battery. Then turn off the donor car and try starting yours. It is much safer for the electronics that way.
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  4. Sulli69
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    Sulli69 New Member

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    [Nov 5, 2011]
    Thanks for the advice - I went over with my leads and did as you suggested and its sorted. Surprised the battery pack didn't have that much power, but there you go...
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  5. SUBSEADESIGNER
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    SUBSEADESIGNER New Member

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    [Jan 2, 2013]
    realize this thread now a bit old but A8s have very complicated electronics around the battery don't use the car to jump another or be jumped..........if you fit a new battery usually a 100 amphr Varta a tech with a laptop needs to update the system with the new battery details otherwise things don't work good and always best to charge a car battery with leads dis-connected and use an intelligent charger that adjusts the amps to suit the battery state of discharge....in general modern cars left for lengthy times, the battery will discharge as even a locked car has many things going on that drain the battery ....security......clock etc etc
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