Self-Study Program

23
Battery
The battery is located below the left-hand seat in order to save space. Direct access to the battery is not
necessary for charging and checking the state of charge of the battery.
There are two slave start connectors in the engine compartment for charging and external power supply.
The battery state is checked using the energy management control unit J644.
If it is necessary to replace and check the battery acid level (e.g. during routine service work), the seat can be
easily folded up after undoing two screws.
The following batteries are used:
● 80 Ah / 380 A
● 95 Ah / 450 A
● 110 Ah / 520 A
The choice of battery depends on:
–Engine
–Equipment
–Country
Battery test
A battery test can be performed using the energy management control unit J644. This test can be started in
the Guided Fault Finding mode or the Guided Functions mode under "61-Battery control - A-Battery, test".
The energy management control unit calculates from various measured values and the history data the state
of the battery and displays the following as a possible result:
– Battery OK
– Charge battery
– Replace battery
In the case of the Audi Q7, it is no longer necessary to test the battery using battery tester VAS 5097A.
The advantages of this new test method are:
– It is not necessary to charge the battery prior to the test.
– It is not necessary to disconnect the battery from the onboard power supply.
– It is not necessary to remove the battery.
The battery acid level can be checked visually in the usual way.