Checking Battery And Battery Terminals For Secure Fit, Hybrid Vehicles: Notes
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2018 Audi S6, 2018 Audi A6 Quattro, 2018 Audi A6, 2017 Audi S6, and 2017 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
If the battery clamp is not seated securely on the positive terminal, disconnect the battery ground strap on the battery negative terminal first to prevent possible accidents.