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Key Battery Needs Replacing

Discussion in 'Model S: Battery & Charging' started by asleshgt, Apr 11, 2016.

  1. asleshgt

    asleshgt Member

    Joined:
    Feb 19, 2015
    Messages:
    33
    Location:
    austin, tx
    I bought my S85 in 2015 Feb and have not replaced the batteries in both my key fobs since then. For the past 2 weeks I have been getting a warning message "Key Battery Needs Replacing" in my main screen and the drivers instrument panel screen. I replaced both the batteries with new Duracell CR2032 batteries, but I still get the warning message on both the screens. I also did reset both the screens and still I get the message. Any idea what would be the reason? I called Tesla service and they asked me to just swing by and they can fix it.
     
  2. BertL

    BertL Active Member

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    #2 BertL, Apr 11, 2016
    Last edited: Apr 11, 2016
    I've experienced continued messages in other FOBs due to low charges even with supposedly new batteries. Other threads here on TMC have reported the same with MS. I'd think your Duracells should have been OK assuming the expiration date was within reason, but some of the cheapo blister packs (that many times don't show an expiration date anywhere) one can buy on eBay and Amazon can be more problematic.

    Other thought is perhaps the battery contacts in your FOB for some reason are not making good contact. I suspect your SC will both replace the battery, then maybe clean those contacts. Will be interesting to see. Please report back!
     
  3. mspohr

    mspohr Active Member

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    Always a good idea to test batteries before replacing. Batteries are expensive. Testers are cheap and can point to other problems and prevent frustration.
     
  4. shelbri

    shelbri Member

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    I had the same issue even after replacing the batteries. They did an update to the firmware and all was resolved. Don't recall which version I was on. No issue since.
     
  5. TexasEV

    TexasEV Active Member

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    Austin, TX
    Service center replaces the batteries and checks it at the annual service. Just remember to bring your second fob also.
     
  6. asleshgt

    asleshgt Member

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    Feb 19, 2015
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    Location:
    austin, tx
    When i went to Batteries+Plus to buy the new ones, I had them check the voltage on my old ones - they measures around 2.9 which is bad for a 3V battery, but the new ones measures good with 3.2V on them. So definitely the batteries are good. I will keep u all posted after I take my car to the service center. Thx!
     
  7. JoshG

    JoshG Member

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    Jun 23, 2011
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    336
    funny, i'm have EXACTLY the same thing this week. continual message even after replacing with brand new batteries. If you get any insight or tips, please pass them on.

    (by the way, this post should be in the general section... it's not really related to vehicle charging)
     
  8. Gwgan

    Gwgan Almost a wagon

    Joined:
    Aug 11, 2013
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    933
    Location:
    Maine
    Got the message last week but then it went away with the latest firmware upgrades. The message returned yesterday. Today I replaced one battery and the old battery’s voltage was 2.93. Service recommended a lock/unlock cycle using the key (single tip press/double top press) and then a screen reboot (two scroll buttons) but the message did not clear until I powered down the car from the Settings screen. I’ve had the car three months and the build date makes the car about six months old. I would have stopped by a service center but they are not close enough to “stop by”.
     

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