Need help reading Dr. Prius battery monitor and life expectancy data

Discussion in 'Gen 1 Prius Plug-in 2012-2015' started by art425, May 3, 2020.

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  1. art425

    art425 Junior Member

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    Hey Prius Chat!

    I have a 2014 Prius Plug-In with ~140k miles. I bought the Carista OBDII dongle and purchased the full tests on the Dr. Prius app. I ran the life expectancy test and got the below results:

    IMG_1697.PNG

    I also have the below battery monitor data that I need help reading. I noticed that the right-most module is (visually) consistently lower than the other 7, and I was wondering if that means anything.

    IMG_1700.PNG

    I have a video of about 45 seconds of battery monitoring while driving slightly uphill with no EV range, just on regular hybrid mode. Unfortunately I can't this due to not having enough posts on the site. In summary, you would see module 8 consistently visually lower while the remaining 7 modules were jumping up and down.

    Ultimately, I'm trying to use this data to decide if this car will last until 250k miles without needing a battery replacement. I read an article stating that a trouble code will come up at 30 milli ohms of resistance. According to Dr. Prius battery monitor test, I'm at 7 milli ohms. Can this information help determine anything in terms of battery life and expectancy?

    Thank you for any help!!
     
    #1 art425, May 3, 2020
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  2. bisco

    bisco cookie crumbler

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    feel fre to post more. i don't know anything about dr. prius, but i can tell you we haven't had any out of warranty failures yet.

    all the best!(y)
     
    #2 bisco, May 4, 2020
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  3. QuantumFireball

    QuantumFireball Active Member

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    I don't think the voltage difference of 0.2 V is anything to worry about. I think I see similar on mine, but I haven't checked in a while.
     
    #3 QuantumFireball, May 5, 2020
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  4. art425

    art425 Junior Member

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    Ya I was thinking it seems like a minute difference in the actual values, because the visualization says otherwise. Thanks for the reply, I’ll try to get in touch with the creator of the app and see what he says about the difference in voltages.

    I’ve tryed to look for anyone posting about any battery failures on the plugin prius, and not really found any. I guess that’s a good thing lol.
     
    #4 art425, May 5, 2020
    Last edited by a moderator: May 5, 2020
  5. QuantumFireball

    QuantumFireball Active Member

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    I think the graph just scales dynamically to the minimum and maximum values present at the time.
     
    #5 QuantumFireball, May 6, 2020
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  6. Ohid

    Ohid Member

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    30 milli ohms for Nimh not for Li-ion. My Prius Alpha started from 12 milli ohms. Internal resistance of Li-ion is higher at full charge. Moreover, all Li-ion battery also not shown in a same way. See the difference between yours and mine.
     
    #6 Ohid, Jul 19, 2021
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