TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker and becoming a Supporting Member. For more info: Support TMC

Near annual replacement of 12V battery is typical according to Tesla Service Tech

Discussion in 'Model S: Battery & Charging' started by ecarfan, Jan 15, 2015.

  1. jamieb

    jamieb Member

    Joined:
    Oct 26, 2013
    Messages:
    157
    Location:
    Sacramento
    Woke up to the '12 volt battery needs servicing' warning this morning. 23 months old, 23k miles. Had the LTE upgrade installed 10 days ago then the car sat in the garage for the last week while I was on the East Coast for Thanksgiving. Don't know if either are related.

    Car runs fine, Tesla looked at the logs remotely, said the battery was at 14 volts and I wasn't at risk of a non-starting car in the near future but that I should replace the battery in the next few weeks.
     
  2. FlatSix911

    FlatSix911 Porsche 918 Hybrid

    Joined:
    Jun 15, 2015
    Messages:
    5,703
    Location:
    Silicon Valley
    What size is the 12V battery, IIRC it's a standard automotive size?
     
  3. JRP3

    JRP3 Hyperactive Member

    Joined:
    Aug 20, 2007
    Messages:
    15,659
    Location:
    Central New York
  4. Ingineer

    Ingineer Electrical Engineer

    Joined:
    Aug 8, 2012
    Messages:
    1,487
  5. FlatSix911

    FlatSix911 Porsche 918 Hybrid

    Joined:
    Jun 15, 2015
    Messages:
    5,703
    Location:
    Silicon Valley
  6. mknox

    mknox Well-Known Member

    Joined:
    Aug 7, 2012
    Messages:
    10,068
    Location:
    Toronto, ON
    Are you sure? Mine has been proactively replaced at least twice (no warnings or failures) and the only way I know this is by carefully going over my Service Order paperwork and finding it listed in the repair activities.
     
  7. JPP

    JPP Active Member

    Joined:
    Feb 4, 2013
    Messages:
    2,671
    Location:
    SF Bay Area, CA
    Just back from my 36k service (...actually at 35k) on my May 2013 S85. Had a 12v replaced at about 6 months (end 2013). Now about 2 years in and no issues. No replacement at this service. All good (...fingers crossed).
     
  8. redi

    redi 2013 P85+

    Joined:
    Aug 31, 2013
    Messages:
    590
    Location:
    DFW, TX
    My 12 volt battery lasted 27 months before the "contact service" warning. I have to say, after watching the process of replacement (what a pita location, assembly/disassembly in my VIN for a battery change-out), Tesla's designer/engineers must have believed that the 12 volt battery was going to "last forever".

    I understand in the newer VINs the battery has been moved to a more serviceable location, but I have not personally eyeballed that to be true.
     
  9. No2DinosaurFuel

    No2DinosaurFuel Active Member

    Joined:
    Apr 16, 2015
    Messages:
    1,245
    Location:
    San Diego, California
    I am not sure if anyone suggested it, but would a LiFe 12V pack work better here? They are supposedly last 2000+ cycles and 10+ years shelf life. I hear they last forever in ICE cars. Considering all the charging and discharging that happens in a Tesla, I think LiFe 12V pack will make much more sense.

    Something like this:
    Amazon.com: Lithium Iron Phosphate 12V 35AH 480CCA Battery for Golf Cart: Electronics

    Or if you want something bigger:
    Amazon.com: Lithium Pros C680 12V Lithium-Ion Powerpack Battery with Top Mount Battery Terminal: Automotive
     
  10. Larry Chanin

    Larry Chanin President, Florida Tesla Enthusiasts

    Joined:
    Aug 22, 2011
    Messages:
    4,667
    Location:
    Sarasota, Florida
    I had my car in for annual maintenance and made sure that the service center knew that my 12 v battery hadn't been replaced in close to three years. Even though I have never seen a warning message they informed me that the message came up while they were woring on my car and they replaced the battery.

    I think that it's great that parts are proactively replaced during maintenance to minimize driver inconvenience while on the road.

    Larry
     
  11. JRP3

    JRP3 Hyperactive Member

    Joined:
    Aug 20, 2007
    Messages:
    15,659
    Location:
    Central New York
    Yup, been discussed a few times, along with LiTiO as well. Both would be superior choices, and though a bit more expensive than SLA I'd think the lack of warranty work and customer dissatisfaction would make it well worth it.
     
  12. Steph_S

    Steph_S CAN #312 VIN P06173

    Joined:
    Nov 16, 2012
    Messages:
    140
    Location:
    Ottawa, Canada
    #212 Steph_S, Mar 4, 2016
    Last edited: Mar 4, 2016
    Tesla Montreal wants to charge me $300CAD for a 12v battery replacement because of the number of 'charge cycles' on my vehicle. I already had my 12v replaced once when the car was fairly new due to the old 12v battery supplier.

    I paid for - and am covered for the extended annual service, and I also think that tesla's "infinite mile 8-year warranty on drivetrain and battery" should cover the 12v battery. A battery is a battery. I'm not happy.

    The annual service should cover "all wear and tear items" except tires.
    Elon's 8-year "battery pack" warranty should cover this as well.

    I declined to pay for this.
     
  13. BertL

    BertL Active Member

    Joined:
    Aug 19, 2015
    Messages:
    2,007
    Location:
    Carlsbad, CA
    #213 BertL, Mar 4, 2016
    Last edited: Mar 4, 2016
    I agree with you. ...especially as the 12V battery is not called out as a customer-replaceable responsibility like it is in most other vehicles documentation, nor are there references that some number of charges will require the owner to replace it in the warranty or service agreements (at least in the US versions I have access to). Tesla provides no specs for the 12V battery in the Owner's Manual and provides no easy access for the owner to replace it like other vehicles do, to me, indicating it's an owner responsibility. My suggestion is to first talk to the SC Manager, then I'd escalate with a business-like letter to Tesla. GOOD LUCK.
     
  14. jbcarioca

    jbcarioca Active Member

    Joined:
    Feb 3, 2015
    Messages:
    3,991
    Congratulations, Larry, on escaping the dreaded 12V failure some of us have. I'm really curious to know the actual proportion of 12V failures. Yours, in particular, seems to be essentially typical for high-load ICE 12v replacement. My experience with Maserati, BMW, MB, Jaguar all have had roughly three year battery life. Porsche has been about two years fro both of those I have had. In spite of all our complaints, including mine, Tesla has handled that far better than all those others.

    My personal nasty surprises included a Jaguar battery failing six months after delivery and the full price charged to me because of unspecified 'abuse'. Then there was a Porsche that had a battery failure the first winter that I also had to pay for. In both of those i did not fight much. In retrospect I should have because there were ostensibly battery manufacturer service life guarantees.

    Contrast that with my Tesla experience which had a 12 V failure in my garage immediately following installation of a third-party charging system, which finally was replaced because it appeared to be the fault. Tesla picked up my car on a flatbed, gave me a loaner, replaced the battery and coordinated the fix with my third party charging provider. Imagine that! Tesla fixed somebody else's fault and picked up the tab. I never was told exactly what the problem was, but my charging system was immediately replaced, tested by Tesla and the third party prior to my hookup, and I was refunded all the charges I had had from the third party during the entire affair.

    You're lucky not to have had battery trouble, Larry, but if you had had Tesla would have wowed you with their superb service.

    JC
     
  15. Steph_S

    Steph_S CAN #312 VIN P06173

    Joined:
    Nov 16, 2012
    Messages:
    140
    Location:
    Ottawa, Canada
    Thank you for your comments. I have 122 000km (75 800 miles) on the car. I can believe that the charge cycles of the 12v might prompt a replacement, but I don't believe it's worth $300 considering i am covered under the service agreement and tesla's 8-year battery warranty.

    I require my car today and therefore can not spare the time to have this installed at this time. (I'm writing this from the service centre) . I'll wait until I receive a "12v needs replacement" warning and then call a Ranger (I also prepaid for this). I will escalate up the chain at that time.
     
  16. Cottonwood

    Cottonwood Roadster#433, Model S#S37

    Joined:
    Feb 27, 2009
    Messages:
    5,078
    Location:
    Colorado
    #216 Cottonwood, Mar 4, 2016
    Last edited: Mar 4, 2016
    The irony is that the more the car is driven and actively charging the HV, traction battery with the HV->14V DC-DC converter active, the less cycling and wear the 12V battery gets...
     
  17. JRP3

    JRP3 Hyperactive Member

    Joined:
    Aug 20, 2007
    Messages:
    15,659
    Location:
    Central New York
    That doesn't sound right. The DC/DC should be active any time the DC load pulls the 12V battery down low enough, and there is more DC load when driving than when not.
     
  18. iffatall

    iffatall Member

    Joined:
    Nov 15, 2013
    Messages:
    691
    Location:
    SF Bay Area, CA
    I have owned my car for over two years (~30k miles) now. My 12V battery has never been replaced. Should I be worried?
     
  19. Lloyd

    Lloyd Well-Known Member

    Joined:
    Jan 12, 2011
    Messages:
    6,018
    Location:
    San Luis Obispo, CA
    My 2013 original battery was replaced in the first year. Two years + later the replacement is still doing fine. I questioned the service center about replacing it, and they said that the newer batteries are lasting longer as they were intended.
     
  20. iffatall

    iffatall Member

    Joined:
    Nov 15, 2013
    Messages:
    691
    Location:
    SF Bay Area, CA
    So do you think my Dec 2013 car might have the newer one?

    Will have to eventually get mine replaced anyway? Do I need to make sure it happens before my warranty expires.
     

Share This Page

  • About Us

    Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.
  • Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


    SUPPORT TMC