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Key Fob Battery Low

Discussion in 'Model S' started by MichFin, Dec 28, 2015.

  1. MichFin

    MichFin Member

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    #1 MichFin, Dec 28, 2015
    Last edited: Dec 28, 2015
    I got "Key Fob Battery Low" warning today after owning the car for 6 months. I've owned other cars with key fobs that are still going strong after 2+ years. What are other peoples experience?


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  2. TexasEV

    TexasEV Active Member

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    Mine were replaced at the annual service the past two years, so they lasted at least one year. I've heard of this happening if you store the keys near the car- such inside the house just on the other side of the garage wall.
     
  3. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

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    Do you store the fob near the car? Some report that if your key is too near the car it seems to make the battery drain faster.
     
  4. Knobby

    Knobby Member

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    Mine have 20 months service and still working fine. But how did it it report that the battery is low?
     
  5. BertL

    BertL Active Member

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    OP, while my Tesla FOB has not needed a battery replacement yet, I'll tell you that with my former Lexus, MBZ and BMW experience, FOB Battery Life is to a large degree related to usage -- I've had them last 6 months to 2-3 years. As TexasEV and FlasherZ suggest, keeping your FOB within closer proximity to the car will reduce it's battery life and from following other forums, tends to be the major issue... To resolve that, move the FOB further away where you store it today, or put it inside some foil or one of the fancy packs or devices designed for such purpose. If you replace the battery yourself, be careful of the super cheap versions from places like eBay that don't come with a marked expiration date -- my experience says many of those are beyond their life before you ever start to use them and you get what you pay for.
     
  6. tanner

    tanner Active Member

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    Mine lasted 2 years
     
  7. MichFin

    MichFin Member

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    #7 MichFin, Dec 28, 2015
    Last edited: Dec 28, 2015
    I keep the battery about 15-20 feet away from the car... through a couple of walls. Same place I keep the keys for the other car.

    I called service to ask them for the battery version and instructions since I could not find it in the manual. They said it peculiar that both keyfobs would show the warning at the same time and scheduled a service tech to come to my house.... Is this not the best service ever.


    "But how did it it report that the battery is low?" The dashboard had a warning updated post with picture.
     
  8. bluefuego

    bluefuego Member

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    I got the same warning mere months after my last annual (and presumably key fob battery swap). Advisor admitted sometimes the batteries they get are iffy - he swapped the batteries in both fob's.
     
  9. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

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    I've yet to have a replacement battery last as long as the original battery in any remote control device.
     
  10. brec

    brec Member

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    This information is on p. 5 of the current Owner's Manual.
     
  11. Btrflyl8e

    Btrflyl8e Active Member

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    Mine lasted 2.5 years. I just recently got the warning, and realized I had a pack of a dozen batteries that were the correct replacements! I bought them in bulk for a clip on light I had for my old Kindle, lol.
     
  12. MichFin

    MichFin Member

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    I did a search for keyfob so I missed it.

    Thanks
     
  13. Nigel16494

    Nigel16494 Member

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    At my 1 year service they switched the battery and gave me a spare to fit myself in the spare fob. I thought that was a nice touch
     
  14. wrmcpherson

    wrmcpherson New Member

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    I have also had problems with the batteries. When the original batteries went dead, I got replacement batteries but some do not have long shelf life. I then got rechargeable batteries and they work but don't seem to last long before they need recharging. Why hasn't Tesla come up with a better idea? Their car is based on rechargeable batteries but they seem to have sloughed off the engineering of the fob to a supplier, who is not technically adept enough to provide rechargeable fobs.
     
  15. garygid

    garygid Member

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    Typically the rechargeable coin batteries are a bit less voltage than their
    non-rechargeable counterparts, so they appear to the fob that they are
    already noticably discharged even when they are new.

    Using fresh coin cells is not difficult, they generally last a year or more,
    and can be changed easily, in just a few seconds.

    If yours are not lasting well, maybe you are storing the fob too close
    to the car ... within fob-shot ... and they keep chatting with the car?
     
  16. iffatall

    iffatall Member

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    My fobs are used pretty much equally and they sit about 15 feet from car one wall across when I'm home. One of my fobs went low battery in about 15 months (no annual service in the interim). Subsequently, both batteries replaced during service after 25 months of ownership.

    So one of my fobs lasted 15 months and the other more than 25 months. Which means fob battery life is unpredictable :)
     

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