Instruction book Audi A4 Version Year 2014
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 Audi A4   General maintenance   Checking and topping up fluids  Battery
Terminals for charging the battery are fitted in the engine compartment.
Note the warnings WARNING! and WARNING!.
Switch off all electrical equipment. Remove the ignition key.
Open the bonnet Link.
Open the cap on the positive terminal.
Follow the correct procedure for connecting the charger cables to the jump-start terminals (terminal with 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.
Close the cap on the positive terminal.
Close the bonnet Link.
When it is discharged the battery can freeze at temperatures around 0°C. You must not use a battery which has frozen, even after it has thawed, because the ice may have cracked the battery casing and allowed the battery acid to escape WARNING!.
Charging the battery
Only use battery chargers with a maximum charge voltage of 14.8 V (the battery cables do not have to be disconnected). The battery must not be opened while you are charging it.
Important: Before you charge the battery make sure you read the manufacturer's instructions for using the battery charger.
WARNING!
Always replace a frozen battery. Never recharge it - risk of explosion!
Note
Use only the terminals in the engine compartment to charge the battery.
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