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Pelican Technical Article:

Battery Replacement

Jared Fenton

Time:

1 hour1 hr

Tab:

$100

Talent:

**

Tools:

10/13mm sockets

Applicable Models:

Audi A6 (1997-04)
Audi A6 Quattro (1997-04)
Audi S6 (2002-03)

Parts Required:

Battery

Hot Tip:

Test battery before hand

Performance Gain:

Car starts again

Complementary Modification:

Replace air filter

Batteries wear out; it is a simple fact of life. The battery is perhaps the most important electrical component on the car, and due to its design and nature, is also one of the most troublesome. Often times, a puzzling electrical problem can be solved by doing something as simple as cleaning a battery terminal.

Due to the design of the car, the best way to check battery condition is to use the factory diagnostic computer or a good aftermarket software package. Using a code scanner, you can monitor the battery voltage as well as current draw and alternator output. Chances are that the vehicle likely has diagnostic trouble codes stored indicating an erratic voltage condition.

A few words on safety are required here. Always disconnect the negative terminal first. If you disconnect the positive lead first, there is a chance that your tool may touch the metal chassis. This will result in a short circuit which could be dangerous to both the car and you.

Be sure to purchase a battery that has the same group number and CCA rating (Cold Cranking Amps). Check the freshness date on the battery that you are purchasing and avoid any batteries that are more than six months old. Note that after you disconnect your battery, the DME computer will lose some of its history memory used for adapting the fuel injection system. As a result the idle may fluctuate and the fuel injection mixture may be slightly off as the car relearns its settings.

You'll also need to remove the cowl panel in order to access the battery. See our article on Cowl Panel Removal for more information.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability.

Vehicle models change and evolve as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

The battery is located under the cowl panel in the engine compartment (green arrow).
Figure 1

The battery is located under the cowl panel in the engine compartment (green arrow). Removing the battery requires you to remove the cowl panel. See our article on Cowl Panel Removal for more information.

Loosen the 10mm nut on the negative terminal (green arrow) until you can pull it off the battery.
Figure 2

Loosen the 10mm nut on the negative terminal (green arrow) until you can pull it off the battery. Then do the same for the positive terminal (purple arrow). Remember, remove the negative terminal first.

Loosen and remove the 13mm bolt (green arrow) securing the hold down clamp in place.
Figure 3

Loosen and remove the 13mm bolt (green arrow) securing the hold down clamp in place. Remove the clamp and lift the old battery out of the car. Installing the new battery is the reverse of removal.

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Page last updated: Fri 12/2/2016 03:00:45 AM