Charging the batteryCharging the battery  - Battery - Checking and topping up fluids - General maintenance - Audi A5 Owner's Manual - Audi A5

Terminals for charging the battery are fitted in the engine compartment.

Engine compartment: Terminals for jump leads and battery charger
Engine compartment: Terminals for jump leads and battery charger

Note the warnings in Important safety warnings for handling a car battery on and .
Switch off all electrical equipment. Remove the ignition key.
Open the bonnet.
Open the red cap on the positive terminal.
Follow the correct procedure for connecting the charger cables to the jump-start terminals (terminal with red cap = positive, terminal with hexagon = negative).
Now connect the battery charger to the mains and switch on.
After charging the battery: switch off the battery charger and disconnect the mains cable.
Now disconnect the charger cables.
Refit the red cap onto the positive terminal.
Close the bonnet

When it is discharged the battery can freeze at temperatures around 0C. A frozen battery must be thawed before charging .

However, it is advisable to replace the battery if it has frozen, because the ice can crack the battery casing and allow the battery acid to escape.

Charging the battery

Important: Before you charge the battery make sure you read the manufacturer's instructions for using the battery charger.

When charging with a low current (for instance with a small battery charger) the battery does not have to be disconnected. The battery must not be opened while you are charging it.

Fast-charging the battery

For technical reasons it is not permissible to fast-charge the battery using charging devices with an output voltage higher than 14.8 V.

Never charge a frozen battery  it could explode. WARNING

Never charge a frozen battery it could explode.

Use only the terminals in the engine compartment to charge the battery. Note

Use only the terminals in the engine compartment to charge the battery.