Battery replacement experience

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01-13-2010, 02:09 PM

#11

chuckee98

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Quote:

Originally Posted by The G Man

By connecting another in parallel before replacing the old one, does the Energy Management system still need to be re-program?

Yes. You're basically calibrating the system to the new battery. Connecting another battery in parallel only retains memory functions.

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01-13-2010, 06:05 PM

#12

DarinS4Turbo

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Quote:

Originally Posted by chuckee98

For what it's worth, the Bentley manual states that the battery should be replaced with a "cycle-proof" / "leak-proof" or AGM battery - which is good advice. I have had a couple of batteries leak in other cars, resulting in corroded battery trays. If that happens in our Audis, you have a corroded trunk, which is ultimately worse. All my cars, except for the Audi, have Optima batteries in them, which are AGM batteries. Also, the Bentley manual indicates that the Energy Management Control Module must be recoded when the battery is replaced (which is what the dealer is essentially saying, and charging an arm and leg to do). This should be do-able with a Vagcom. Does it make a difference? Don't know. But the Energy Management system is responsible for shutting down non-essential electrical components sequentially when the battery starts draining.

Take it for what it's worth.

That is a good point chuckee98. I will certainly report back if an issue arises, but my gut feel is the new battery is 'close enough' in spec such that the basic power management functions will still operate effectively (with at worst an imperceptible loss of precision). E.g. if power management shuts something down when it thinks battery is 70% drained when it is actually 72% drained...