I thought it either wasn't getting charge or not holding charge and as the alternator warning / battery symbol hasn't illuminated then I assumed the battery had failed quickly, maybe I'm wrong?
It turns over rapidly enough for me to realise it's been fairly sluggish for a while so hopefully the new battery has resolved the issue.
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Audi D3 S8 - 2007 - V10. B&O, Phantom Black, black and silver interior, and still completely standard with everything working as it should
Audi TT - 2015 - Ultra