Audi A4 battery to fit RS4 Petrol (2005-2015) compatible part Varta Silver Dynamic Car Battery 12V 110Ah 920CCA I1 Type 020. Best in Class Performance for Highest Power Needs. You´ve got a highly equipped car? The VARTA Silver Dynamic is the perfect choice for non-start-stop technology with the highest power needs. It offers supreme starting power that will meet the toughest energy demands without compromise.