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New battery?

KrisKrk Mar 31, 2019

  1. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    Happened it to me few times already.

    While doing some work on the car and listening to music for about an hour, battery went dead to the point I had to jump started off another car.

    After first occasion, I enabled the battery meter in MMI to monitor the charge on next jobs.

    No music but ignition on and it happened again after an hour or so.

    If the battery level goes down to a very low level, I start the car and let it running for half to an hour and it charges to about 60%. Next day have no problem to charge the rest of full and continue keep it 100%.

    Don't have any drain as even after a weekend parked up, it maintain the same level.

    Thinking if the battery health has decreased to a replacement needed level or could a complete drain down and full bench charge up help?
    What should I expect from the battery life?

    Had the car since 77.5k miles about 3.5 years ago and now 104k and 9 years since first registered.
    Doubt the previous owner had it replaced.

    Sent from my CLT-L09 using Tapatalk
     
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  3. desertstorm

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

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    A 9 year old battery will probably only have 50% of the capacity of a new battery.
     
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  4. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    Will any garage be able to test its life or do I need to go to Audi?

    Considering this may be the case of replacement, is there a upgraded battery model I can or should replace it with?
    Is there a point of upgrading it or just keep it same spec?

    Sent from my CLT-L09 using Tapatalk
     
  5. abmat

    abmat Active Member Team Dolphin Grey Team V6 VCDS Map User Audi A6 Audi A3 Audi Avant Owner Group quattro

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    Most Kwik-fit type places should be able to test it.
     
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  6. B5NUT

    B5NUT Well-Known Member TFSI Owners Group VCDS Map User Audi A6 Audi A3 Audi Avant Owner Group quattro S tronic S-line owners group

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    The MMI system takes a hell of a lot of power, you have about 6/7 modules (depending on spec) all running and eating into the battery, it's not like the old head units with no screen and an internal amp. Best your ever going to get out is about 1.5 to 2 hours depending on how many modules you have to power and the size of the battery. The battery display on the MMI system is rubbish, it's why they never enabled it from factory.

    Also 30min would never be enough time to charge the battery to 60% if it was almost flat, from memory it take about 18 hours to fully charge a flat battery.
     
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  7. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    Well, it takes about hour or just over it to have about 60% from 3 dots on mmi screen. Assuming dots are equal to percentage if the battery.

    Usually by the next day drive I can see full charge on mmi.

    Will get it check first before taking decision on new battery.

    Thx again

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  8. Neil Woodburn

    Neil Woodburn Active Member

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    Personally I wouldn't go near Halfords but go to a Specialist Battery outfits ie one which only sells batteries - you may need too have the battery code re loaded into the A6 Computer and that is not a simple job. I just had a battery replaced under warrantee at Audi £450 on work sheet !

     
  9. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    Wow! Thank you Neil.
    Thought it would be simple swap.
    Will do some research on it, if my car need this coding.

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  10. B5NUT

    B5NUT Well-Known Member TFSI Owners Group VCDS Map User Audi A6 Audi A3 Audi Avant Owner Group quattro S tronic S-line owners group

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    Coding is very simple, just swap the battery like for like then change one of the digits in the battery serial number coding. Job done, the battery is not intelligent you just telling the BCM or gateway a new battery is fitted.
     
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  11. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    Does it have to be done through vcds or can be done in mmi?

    Sent from my CLT-L09 using Tapatalk
     
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  13. desertstorm

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

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    You don't have to code a battery if the new one you fit is the same specification as the original. The car will learn a new battery has been fitted after a while. Coding a battery tells the car what kind of capacity the battery should have and what technology the battery is normal lead acid, EFB AGM etc.
    When a battery gets really low the car starts can start turning things off to preserve the remaining life. If you code a new battery with VCDS the module will immediately know that a new battery has been fitted and normal operation will be resumed. If you don't code a new battery it will take some time for the module to detect the new battery and correct operation will take some time .
    Find out what battery you have and get a Varta silver from somewhere like Tayna.
     
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  14. dgs2001

    dgs2001 New Member Team V6 TDi Audi A6 Audi Avant Owner Group quattro

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    Have just replaced my Varta 019 Battery with an Exide one, Interestingly the old Varta battery was still holding around 70% - 80% charge and showing 12.4 volts.

    I was surprised that a battery which was still operational to a level of circa 70% was causing some faults to appear in the elctronics modules, but it was.

    Once the new battery was in and coded the faults all cleared and the car is noticably happier :)

    If you purchase from a Battery shop they will have a coding device which will complete the coding. If you end up fitting a battery which has no BEM coding information then you can just change the existing battery seriel number within VCDS ie if the serial number coded is 12345678 then change it to 87654321. The actual serial number is not important although the type and capacity is.

    As my old battery was showing some signs of life I have attached it to a reconditioning smart charger to see if it can be recovered and reconditioned.
     
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  15. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    Thank you for useful info.

    Didn't got time yet to go the battery shop and test it.
    My MOT is expiring next month so thinking, if the garage can test it while I'm there.

    Old battery if your held 70-80% and was giving you problems? Wow
    Wonder what mine is. No problems, God forbid, but that short charge hold made me wonder

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  16. bredhurststeve

    bredhurststeve Active Member

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    Can VDCS tell you the health of the battery?
     
  17. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    Would need to speak to someone who have VCDS and check it that way.

    So far, I have encountered few problems battery related.

    Recently installed a dash cam and it's hardwired for parking mode. After few weeks, constant feed was ok but switched started to drop voltage by 4-5v for a split second, what put the camera into parking mode only to discover the switched power is back.
    Camera ended up in loop reboot every minute and annoyed me so much, I have taken it down.

    Send it back to the UK distributor and they tested it to perform as it should untill they mock up power drop fault. It confirmed camera behaviour so the issue is with car's power.

    Also, had a car in the garage for rear springs replace and been told, the battery died on them twice.
    They must've had it with ignition on all the time as what they were doing had nothing to do with power.

    To top it all, thought if finally getting the battery tested so went to QuickFit.
    I don't know why, don't ask me.
    Think it was on the way so I dropped in.
    A guy in there connected the piece and tested the battery saying afterwards "its ok but you need to recharge it, take it for a 45min spin on a motorway and it will charge up".
    Pictured print out from the piece he connected.
    I asked him "does the machine tell you general health of te battery?" He replied "no".
    It is printed at the bottom of the slip.
    I told him about the above dying fact at the garage and he said "oh, I don't know".
    OMG, what kind of people are working there?

    Anyway.
    After checking the printout it looks like to me that battery is below 50% but still above minimum to be bad.
    Checked the battery meter on MMI and it show full.
    I'm confused now.

    While I was doing car clear out, took a picture of the battery.

    Shall I get a new one?
    If so, stronger like a 100 or 110Ah would be recommended?
    What brand I should choose and what to avoid?[​IMG][​IMG][​IMG][​IMG]

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  18. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    Went to Tayna website and from reg no searches it showed me Enduroline 019 100Ah and by looking it up from car manufacturer and model, Enduroline 096 77Ah.
    ECP have more choice to my reg than them.

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  19. B5NUT

    B5NUT Well-Known Member TFSI Owners Group VCDS Map User Audi A6 Audi A3 Audi Avant Owner Group quattro S tronic S-line owners group

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    The battery meter on the MMI is useless, it why they disabled it on later MMI systems. If it's the original battery then it most likely will need changing. Also running the MMI system on battery sucks the life out of it, I got a couple of hours of running the MMI system before it started to shutdown due to low battery. VCDS also won't give you the health of the battery you need a proper tester for that.
     
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  20. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    Had another test in the battery done and it also said the battery is good, just need recharging.
    Head scratching started when they tested battery charging option and with ignition/engine off it showed 13.03V and with engine running, lights fan on and whatever that could give load to the battery, it only showed 13.33V. That would indicate alternator fault.
    The garage didn't had a space on the ramp so they could bot test it right by it so need to book it for another day.

    Where is the alternator located so maybe I can just measure it with multimeter?
    Can find the location on PFL models but not mine FL.

    As battery might be to replace, I need to get this sorted first so a new battery don't end up like that one.

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  21. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    I would've thought so now as over 1000miles journey didn't charged up the battery and MMI still show full.

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  22. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    Spoken to a mate of mine who knows how to do stuff around the car and he recons I've got a problem with voltage regulator on the alternator.
    Small part that can be easily replaced, without taking the alternator out.

    Managed to get the code of the alternator and tried my luck for the replacement part on the internet.
    Prices shocked me how high they are for the whole alternator or how low they can be for the voltage regulator only.
    Couldn't however find the right for the alternator in the car atm by just the code from it.
    Rang up Audi but I can now cross that option of my sourcing list.

    Before I start thinking of £200-£500 alternator, I want to give this £15-£30 voltage regulator a replacement to see if it helps.
    Worse come to worse, I'll change the whole thing but maybe it can be done at the low cost.

    Can anyone help with part number or place to look for the voltage regulator for BOSH alternator?
    Here's all I could read off of it:

    AG
    03G 903 016 L
    14V 180A
    Bosh
    0121 715 077 025

    Don't even have time during the day to look for parts or go to the proper garage.
    Got hell at work from am to pm.

    Any help would be appreciated.

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  23. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    Got the replacement voltage regulator today and tried to fiddle with it.
    Undone few bolts from the alternator back cover but two are hard to get and do not budge.
    Little to none access in there and all them pipes are in the way.
    No spanner, ratchet, allen key or anything to undo these screws will fit there. My palms including.

    Can anyone shed some light if voltage regulator replacement can be done with alternator still intact?
    If not, do I need to take the front off?

    Looked for alternator mounting bolts but can only find one by touch. Not an easy access but think it can be undone, with longer ratchet, as my hands will not fit there either.

    Done some voltage test and it doesn't look good.
    With lights on, side mirrors and rear screen heating on, fan on and front+rear fogs on, reading show 13.24volt and with just engine running 13.3volt.
    11.84 is the reading with nothing on, engine off.
    Loosing juice here and not enough charge.[​IMG][​IMG][​IMG]

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  24. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    Another shot last night with the alternator.

    This time I tried to remove it whole and than replace the voltage regulator.
    Undone top alternator mounting bolt, and another below however the whole thing would not budge out.
    Pushed it, pulled it, wiggled it and still nothing.
    I couldn't see any other bolts so put it all back together and went to friendly garage.
    I'm booked for next week Saturday and the guy will have a go at it.

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  25. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    Had voltage regulator replaced on the alternator Saturday and when came back home, multimeter showed 14.68-14.7V.
    Thought, YAY!, sorted.

    When I switched the engine off to check the voltage on the battery it showed 12.27V what was better than before (11.something V).
    Than I switched the ignition on and started the engine to see 13.72V in the battery.
    Loaded on with headlamps, heaters, A/C and so on and 13.83V shows. WTF?!
    Where the 1V gone?

    Is there something I'm missing, doing wrongly or just lacking knowledge on?

    Someone told me, I need to use a booster or a car battery charger to bring the battery back to life as now, alternator will charge just the "top of the battery".
    Another person (guy at kwickfit, so don't think it was a valuable tip) said, to run the car on motorway for about an hour and that should charge the battery up.

    Pulling my gray hair out now.[​IMG][​IMG][​IMG]

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  26. KrisKrk

    KrisKrk A6 C6 4F 2010 LeMans Avant Gold Supporter TDi Audi A6 Audi Avant Owner Group S-line owners group Manual Le Mans Edition

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    Had a car professionally diagnosed and scanned for any faults and errors this evening.

    Found 20 errors.
    What? Where? How?
    Must've been old ones and were nothing major.
    All cleared and moved on.

    System and engine checked. Running smooth and fine. All sound.

    Alternator working properly and values are good.

    Battery good and have juice.
    As it has not been changed in my 4 year ownership and presume it wasn't either during ownership of the previous, first owner, I have been congratulated of having a good/healthy 9 year old battery in the car.
    Been only warned that it may not survive cold winter that is forecasted to come this year.

    I will leave it for now and see how it behaving. If anything, I'll get it changed.

    Been lurking around recommended tayna website but no Varta Silver have same or higher values.
    Only one cought my attention: Duracel 100Ah and 850A.

    You guys think it's worth it?

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