For what it's worth, I had battery problems when I picked up my new car. It wouldn't hold charge, and the electrics and gearbox (limp home mode) were doing strange things. I charged the darn thing a number of times, and some electrical items behaved, others did not.
Dealer changed the battery straight away, and everything is 100% - been okay now for a few months since the change.
If your battery isn't up to it - chop it for a new one.
2002 S8 BTW.
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 Yeah baby!!
2002 Aqua Blue S8 with Milltek - Now sold 
SL55 AMG Silver with designo red leather and 20" Carlsson 1/16 Utlralight Wheels
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