Battery for Audi A6 2006

**sapstar** · 23-09-2013,03:20 PM

Hi Gupsterg, Apole, Thanks for the detailed responses. I have went back and checked my battery again and see it may not be a Genuine Audi and just a generic one.

Last time when Gupsterg analysed my car data sticker and sent me the meaning of all the codes, I had "J0Z = Battery 520 A (110 Ah)" in that. This might mean that the car originally came with a 110Ah battery and later got replaced to an 88Ah it has now. I had my fault codes checked with this battery before, may not be with VCDS. But it didn't show anything related to battery at that time. I see that there is someone near my work with VCDS as per Chirs's map. I will try contacting him and see if I can get my car checked. If I can have peace off mind by just buying 110Ah battery and without any coding, then I am happy to do this.

I just checked battery with a multimeter and it was giving me reading of 12.5 when engine is off and around 13.7 when engine is running. Not sure if these readings really say anything. The battery itself looks line new. There is no corrosion on the terminals.

**apole** · 23-09-2013,03:24 PM

No worries. I'd go with the size fitted orginally, likely when it was changed they went for smaller/cheaper option.

Volts you found would indicate alternator is working but you do need a VCDS scan to know more about what is going on. Looks can be deceptive, is there a date sticker anywhere on the battery?

Andy

**gupsterg** · 23-09-2013,03:35 PM

Now this may mean your battery regulation module is coded as a 110Ah but a 88Ah is fitted, depend what occurred on changeover. If you get VCDS auto scan done and post log we can tell from that if all is correct coding wise

.

When you have you car unlocked the car is partially alive, running multimeter test does show something but is inaccurate as a no load battery test.

You will note the hazard light switch will glow on the A6 after locking and then switch off after a while, this denotes when car goes to sleep.

I could run multimeter tests on mine when car was locked as in an Avant the battery is still visible whilst fitted. I don't know if boot left open on a saloon will allow car to enter sleep mode.

Are you just changing due to wishing to? or are you having issues? pre-empting winter issues with old battery?

**sapstar** · 23-09-2013,04:23 PM

Andy - There is no date sticker visible on the battery.

Gupsterg - I want to change just to avoid any issues during winter. I travel quite a lot and don't want to get stuck somewhere in winter due to dead battery. Last year I noticed that the car was taking a while to start in winters. But perfectly fine after the winter. Also I had to get jump start twice due to dead battery. Both times because I spent some time in the car with radio on and engine off (around 45 mins).

I have one problem. Not sure if this is normal behaviour or a battery related issue. When I turn iginition to on position, the surround system goes off and turns on after few seconds.

**gupsterg** · 23-09-2013,04:56 PM

I went for a Bosch S5 110Ah battery, as mine was a 110Ah from factory as well.

Coding was correct so all I did was change the serial in the battery regulation module to make the car aware it is has a new battery.

Here is VCDS info Link:- Audi A6 (4F) Battery Replacement - Ross-Tech Wiki

Do connect the vent tube (item 3) and block one side off with cap (item 2) Link:- http://www.jimellisaudiparts.com/sho...String=battery.

**2fquick** · 23-09-2013,06:30 PM

I went for this Varta I1 Varta Silver Car Battery / Varta Batteries / Batteries by Application

When I was looking for a battery I found a lot of sites listed a 100Ah battery not the 110Ah originally fitted.

**sapstar** · 23-09-2013,07:13 PM

Hi Gupsterg - I will probably get the below battery.
Varta Silver I1 Heavy Duty Car Battery 110AH SIZE 200 | eBay

I have contacted a forum user who has vcds. If I get some help, I will get the faults checked. If not, I am considering just going with 110Ah without any recoding.

**sapstar** · 23-09-2013,07:26 PM

hi 2fquick - you beat me to it. I found the same battery

.

**MarkTM** · 23-09-2013,08:35 PM

My advice would be to:

1. Purchase and fit the correct battery for your car, certainly the 110 with it's higher cranking amp needed for all your electrics
2. Invest in a good quality battery charger something along the lines of the CTEK MXS 5.0 that I purchased for under £50 in delivery.
3. Connect the permenant connection lead to your Audi and plug it in periodically (bi-monthly) to condition your battery

That way your battery should last well beyond it's guaranteed life

**sapstar** · 24-09-2013,09:17 AM

Originally Posted by MarkTM

My advice would be to:

1. Purchase and fit the correct battery for your car, certainly the 110 with it's higher cranking amp needed for all your electrics
2. Invest in a good quality battery charger something along the lines of the CTEK MXS 5.0 that I purchased for under £50 in delivery.
3. Connect the permenant connection lead to your Audi and plug it in periodically (bi-monthly) to condition your battery

That way your battery should last well beyond it's guaranteed life

Hi Mark, Thanks for the advice. Yes I will be going with a 110Ah battery. The car charger is not feasible for me as my car is parked behind my house in a car park. So it is not possible to connect to a power supply. I drive around 300 miles every week, so I think the battery should be fully charged all the time any way.