Be careful here , leaving the engine running on the jumping car can cause its alternator to go to full load in an instance as the dead cars starter cranks over .
The dead car because of its flat battery doesn't have the same 'buffer' effect to calm the surge down .
I've seen quite a few of ' my alternators packed up now since jumping my mates car '
The a8 having battery monitoring may be able to deal with this effect better than others though
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