Coding in a new battery

[szladob]

Would somebody be able to point me in the right direction (tried a search but couldn't find), please? I need a new battery for my A6 C6 (2L TDI), and remember about it needed to be coded in? Is that possible with VAG cable? Any instructions would be greatly appreciated! Many thanks!

[swalker]

on the C6 some BCMs do and some dont. i see you have a face lift so gonna take a stab in the dark and say you do.
VAG com will do it - did you try the ross tech website?
but i am also going to say as long as you replace like for like you will get away without coding, the BCM will learn the new battery -
think about winter driving vs summer driving different demands on charging.

[Crasher]

All the coding does is tell the Battery Monitoring Unit the battery has been replaced so that its learnt values are erased so it does not overcharge the new part. When fitting a Varta (all we will fit) we find the serial is one digit too long but as long as the brand code and size are correct, all you need to do is chnage the serial by one digit or however much of the serial you can enter.

[szladob]

Many thanks for the help. Do you find Varta to be a great alternative to what Audi sells for a fortune, or it's more about the system recognizing it well? I was looking at Varta, but a Bentley mechanic mentioned to me that they are super happy with Exide batteries (bit dearer than Varta or Bosch).. Tx

[Crasher]

All modern batteries are ****, especially AGM types. Exide are fine, we are happy with Varta but even one of their 096 AGM's fell over and died within a month on our loan car Passat. The worst by far in our experience is Yuasa with the 5000 series EPB version being awarded a Gold medal for failure as EVERY single one we fitted failed as did their replacements.

[szladob]

Many thanks for the replies! Had a look, but for me the '61 - Battery regulator' panel doesn't show up when I connect the VAG Com, so this should mean that it is not designed with coding in? Many thanks

[Crasher]

What is the VIN?

[Crasher]

To illustrate my opinion of modern batteries, I changed one on a 2007 Golf 5 yesterday, it was the factory fitted original and was just starting to get a little sluggish... 16 years old!

@szladob Your car has a J367 battery monitoring unit 8K0 915 181 C on the earth cable with a comms line to the CAN BUS unit address 19 on the blue wire but not the J644 type mounted to the rear panel which must be coded in address 61

This is the VCDS procedure Battery Replacement - Ross-Tech Wiki

[szladob]

That's very helpful, many thanks! I'll try this 19 CAN gateway, as I don't have the 61 (5F, 62, 6D is the order). On a separate note, may I ask if there is a way to reset the rear wiper? It got wet somehow inside, which was probably what giving a hard time to my old battery (13 year old) - did open the lid cover inside, dried things, and battery is now happy (also being warmer now in our area) but the wiper still has it's own mind - starts on its own, stops, in the wrong position, etc..
Many thanks again for all your valuable help!

[szladob]

Many thanks for the help. Finally managed to get to replacing the battery, which seems to operate OK (few error messages popped up (tyre monitoring, ABS), but seems I got over those now. However, the coding in didn't work out at all.. I have found the long code under CAN 19, channel 4, but when I put in the new long code, hit test, it just displays the old code, and the save button doesn't light up. The battery is a I1 from Varta, same size as the one that was in there - BEM code sticker on it says: 8K0915105F MLA1809088QS9, which is not exactly what VDCS showed: 8K0915105F MLA 080908QS9F.

The data of the new Varta are:

Brand	Varta
Product Code	I1
DIN	610 402 092
Range	Varta Silver
Voltage	12 Volts
Technology	Wet
Capacity (C20)	110 Ah
CCA (EN)	920 A
Length	393 mm
Width	175 mm
Height inc. terms	190 mm
Other References	UK Ref 020, 610402092, 610 200, VW 1J0915105AK
Guarantee	5 Years
Barcode (EAN)	4016987119587

I have tried to enter 1J091505AK VA0 6987119587, but no luck.. Tried also with the 610402092 number, and different parts of the EAN number (this should be the serial number, right?)

Any advice would be greatly appreciated. While the car seem to operate OK, I do have weird errors popping up in the scan that keep returning even after clearing them.
Many thanks!