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Audi S4 (B8) Battery change.

sixpot Oct 5, 2015

  1. sixpot

    sixpot Active Member

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    After a few cold mornings last week with most of the electrics switched on, I noticed on the MMI battery meter it had dropped to 60%, having never really been lower than 90% beforehand. Ran around with the car for a few days, with everything switched off, just to monitor the battery, and it never went back over 60%.
    It was the original (2009) battery, so I assumed it was on it's way out, and I didn't fancy coming out to the car in the middle of winter for it not to start.
    I priced up a few batteries, but aftermarket ones are difficult to code in with VCDS as they don't have a BEM code sticker to update the battery regulator/monitor.
    My old original battery was a Varta 110a/h, so I went to TPS to buy a genuine replacement.
    The old battery number 8K0 915 105F has been superseded by part number 000915 105DL and costs £193.94 RRP. With my discount it came to £139.64 which is perfectly acceptable for a OEM battery.(these battery's are huge!)
    All fitted and coded in no problems, and MMI battery meter is back up to 100%. All ready for winter now!
     
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  3. desertstorm

    desertstorm Moderator Staff Member Moderator VCDS Map User quattro Audi A4 Audi Avant Owner Group TDi

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    I have a 110 AH Varta in my 08 3.0 TDI that is original and will probably be changed shortly. The measuring blocks in the CAN module have calculated the capacity around 46Ah. I will be replacing it with a Varta I5 which is the same battery as the OE one but a lot cheaper.
    http://www.ebay.co.uk/itm/Varta-Sil...-Rover-Audi-/271987730444?hash=item3f53bb680c

    There was a thread on here recently where the owner of an S4 replaced his battery and just copied the coding from the old battery. And this worked fine.Alternatively some threads seem to say change a digit in the serial number and the car will accept that as a new battery.
    I will be trying that as it seems to work OK. And the new battery is the same as the old one.

    Karl.
     
  4. xpoweruk

    xpoweruk TTTS 8J Smile Machine Team Meteor quattro Audi TTS

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    I just did my S4 with an aftermarket AGM battery.(same spec)
    I used the original code & saved it as a new battery & all is good
     

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