Auxiliary Battery -A1-, CHARGING, 0K4 AND VH0
WARNING: This page is about a different car, the 2021 Audi S4 and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
The Auxiliary Battery -A1- is switched in parallel to the Battery - A-. When charging the Battery -A-, the Auxiliary Battery -A1- is also charged. The battery charger is not designed for being connected directly to the Auxiliary Battery -A1-.
- Use a high-performance battery charger.
-- Charge the Battery -A-. Refer to Battery -A-, CHARGING .