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12v battery issue, Tesla horrific response

Discussion in 'Model 3' started by Tjhappel, Sep 19, 2020.

  1. vogz

    vogz Member

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    No they won’t. Just searched on Advance Auto Parts website and they offer 3 different 12V batteries for the Model 3.
     
  2. vogz

    vogz Member

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    Couldn’t agree more.
     
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  3. Daniel in SD

    Daniel in SD Well-Known Member

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    When I search they list three batteries of different sizes, all wrong. o_O
    Seems worse than just listing no batteries TBH. I think something is screwed up with their database.
    Screen Shot 2020-09-28 at 1.37.22 PM.png
     
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  4. Phlier

    Phlier Bluebird

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    I might do that when mine goes bad... I cast my own bullets for hand loading ammunition, and lead-acid batteries can be a good source of lead for casting, but it's also a pain to do it safely.
     
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  5. vogz

    vogz Member

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    I apologize, I didn't have time to investigate the battery options to see if they were the right size.

    I'm sure most auto parts stores would have a 12V battery with similar dimensions available in a pinch though. It's not rocket science and could get you back on the road until you were able to source a proper replacement.
     
  6. Daniel in SD

    Daniel in SD Well-Known Member

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    Yes. Apparently a 51R battery will fit. And if you're calling AAA just tell them you have a Nissan Leaf. :p
     
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  7. SageBrush

    SageBrush 2020: Drain the Sewer

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    Speaking of the devil, I bought a 51r interstate branded 12v from walmart a couple of years ago for our LEAF and it is still doing fine even though I don't think it is a deep cycle battery. Perhaps it knows that it has a 5 year warranty ;)
     
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  8. alstoralset

    alstoralset Man from another place

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    Has anyone tried desulfating one of these failing batteries?

    I've had good luck desulfating a few batteries that have failed to the point that they won't hold a charge. After a couple of weeks of desulfating with the unit below, they become operational again.

    It would be scary to desulfate a Tesla battery in situ, so this would probably be something you do with your first battery after getting a replacement, unless you can pull the battery and not drive the car for an extended period.

    https://www.amazon.com/gp/product/B00D7HZ6FC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
     
  9. Blue Express

    Blue Express Member

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  10. Margaritaboy

    Margaritaboy Member

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    Yeah, not a big deal to just replace it. Not different than an ICE vehicle.

    I walked into NAPA auto parts with the dead battery, they had a replacement in stock. Period.

    took me about 4 minutes.
     
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  11. Daniel in SD

    Daniel in SD Well-Known Member

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  12. Daniel in SD

    Daniel in SD Well-Known Member

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    Yep. As long as you ask for a 51R or get someone willing to measure the size you’ll be fine. I don’t think the Model 3 is in their database since they don’t sell the “exact” battery.
     
  13. smatthew

    smatthew Active Member

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    I don't think a desulfator isn't going to help most failing batteries we hear about here. If the battery was just having difficulty holding a charge, that would be when you get a nice error message and have a fair amount of time to deal with it. But most failures we hear about appear to be shorted cells and corroded plates.

    Plus batteries only get sulfated when they're constantly undercharged. Not really what's going on with a Tesla.

    However, if you already have a desulfator, give it a try on your old battery after you get a new one and let us know!
     
  14. SageBrush

    SageBrush 2020: Drain the Sewer

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    What about front/back positioning of the posts ?

    From pictures I get the impression that it is not standardized. My recollection (don't take my word for it !!) from the last time I looked at the Model 3 battery is that the positive terminal is to the left and back of the battery but that the terminals may be long enough to also attach to posts in the front
     
  15. beachsideev

    beachsideev Member

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    that is what the "R" in 51R is for. Right positive terminal. It installs backwards.
     
  16. SageBrush

    SageBrush 2020: Drain the Sewer

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    Does that mean that all 12v batteries are oriented for labeling with the posts in the front ?
     
  17. beachsideev

    beachsideev Member

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    That is supposed to be the way it works. I can't that it is 100% true but it has been in my experience.
     
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  18. RayK

    RayK Active Member

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    It's not really "front" vs. "back". It's the positioning of the positive terminal with respect to the long edge of the battery closest to it. Most 12V batteries will have their terminals closest to one edge than the opposite side. When a battery of a particular physical size and CCA rating is available in two group versions, the non-R (sometimes it's an F) battery will have the positive terminal on the LEFT, whereas the R (or F) battery will have the positive terminal on the RIGHT. This can be seen in the chart here:

    BCI

    Column title BCI is the group number for the battery, while Polarity is stated as L/H-POS for left hand positive or R/H-POS for right hand positive. Examples are 21 vs 21R, 24 vs 24F, 27 vs 27F and 34 vs. 34R.
     
  19. scottf200

    scottf200 Active Member

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    Despite my best efforts of testing & monitor (IR) my 12v , I had a 12v battery failure during an OTA update while on a road trip. 2020.40.3 was successfully installed on 1000s of cars so I was confident ... famous last words.

    The article I found and mentioned in the below thread shows Tesla is following common guidelines for maintaining the 12v as far as I can tell via empirical evidence I see.

    I monitored the 12v battery voltage during an OTA update
     
  20. Daniel in SD

    Daniel in SD Well-Known Member

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    Yeah, don't do that. I only do OTA updates with the car in my driveway with another functional car next to it. :p
    I wonder if the problem is that Tesla got a bunch of bad batteries from the supplier. It sounds like the failure mode is not typical capacity degradation so they're have trouble detecting it.
     
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