Does a new battery need to be coded?

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Feb 15, 2023 | 11:05 AM

Pelican Pete

Thread Starter

AudiWorld Super User

Joined: Mar 2000

Posts: 8,214

Likes: 10

From: Fairfield, CT

Does a new battery need to be coded?

I thought I read something here about needing to code something into the car when the battery is replaced. But now I cannot find that post, and I don't remember the details.

My "new" car should be arriving tomorrow. And while it's in very good condition, I suspect it is still on the original battery. So I will likely be replacing the battery pretty soon.
Is a battery covered under CPO? (I doubt it but figured I'd ask)
Ideally I'd like to get an AGM battery.

Anything I need to know?

Thanks
Peter

Feb 15, 2023 | 12:08 PM

dirtyjack

AudiWorld Junior Member

Joined: Jan 2022

Posts: 30

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this has been discussed in a few threads

https://www.audiworld.com/forums/a4-...3048474/page2/

https://www.audiworld.com/forums/a4-...et-ok-3032534/

Feb 15, 2023 | 12:41 PM

LightningTruck

AudiWorld Member

Joined: May 2002

Posts: 529

Likes: 182

From: USA Northeast

Yes. Do you have a VAGCOM or OBD11 tool?
It needs to be AGM.
I have my eye on this one:
https://www.fcpeuro.com/products/aut...dyssey-94r-850
Or this one:
https://www.walmart.com/ip/seort/40685088
.

Feb 15, 2023 | 02:03 PM

142 guy

AudiWorld Senior Member

Joined: Nov 2021

Posts: 1,610

Likes: 565

From: Saskatchewan Canada

As noted, yes to adapting the charging controls for your new battery. The car will run without the adaptation; but, your new battery may not stay new for very long

OEM battery on the B9 should be AGM and you should replace with AGM. I don't know about pre B9 A4s; but, the B9 makes fairly heavy demands on its battery. Stand around your B9 after you turn it off and you can hear stuff running (after run cooling pump, radiator shutters). The parasitic loads are significant. Since you live where it gets sort of cold, if you do much short hop driving you might want to consider the addition of something like a Ctek charger (Ctek just because that is what Audi in Canada buys and sticks an Audi sticker on then charges double price at the dealer).

Audi S4 Battery charger - 420093050D - Genuine Audi Accessory (audiaccessories.ca)

Feb 15, 2023 | 04:20 PM

SchwarzS6

AudiWorld Super User

Joined: Jun 2006

Posts: 2,023

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From: Southington, CT

Make sure you really need a new battery before you spend the money. I live in CT also and I have owned a LOT of Audi's. I think I have only replaced two batteries and I often ran cars for 120,000 to 140,000 miles. Because the battery is in the trunk it is not exposed to the heat of the engine and heat is the killer of batteries. Yes the A4 makes a heavy demand on the battery but it also has a very sophisticated power management system and I suspect the battery will last quite a long time.