Battery very weak after driving any distance. Have to wait 20 min before restarting.

Asked by JErbes Sep 22, 2016 at 12:43 PM about the 2002 Audi A4 3.0 quattro AWD

Question type: Maintenance & Repair

2002 Audi A4 3.0 Manual.
Car starts fine in the morning. If I stop to get gas or stall it, the battery suddenly becomes very weak and barely has the energy to restart the car.
However, if I let the car then sit for 20 minutes, the battery regains enough energy to start the car.
I have no clue as to what is going on.

2 Answers
101,755

KenF answered 7 years ago

Get the alternator checked, it likely not putting out enough to keep battery charged. Any auto parts store can do these tests for free (at least in the USA).

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JErbes answered 7 years ago

The alternator was charging at 14.3 volts. Battery voltage drops to 8.5 when starting. For some unknown reason, the car is harder to crank when warm than when cold. Replacing battery fixed problem. Battery was probably 6 years old.

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