how do you read dr. prius app

Discussion in 'OBDII iPhone App' started by atown636, Mar 15, 2020.

  1. atown636

    atown636 New Member

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    What am I looking at here? How do you decode what Im seeing? Is theres source guide that Im missing?

    I assume I want all internal resistance to be similar? or do i want them all 0?
    And the Battery Voltage graph is consistently moving, so i assume there's is some what to see a trend there?

    Any other information on how I should read the upper Blocks, what is good, what is bad, would be appreciated.

    Thanks in advance
     
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  2. ericbecky

    ericbecky Hybrid Battery Hero

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    Take a look at the videos on the app's website.
    Hybrid battery diagnostic and repair tool for Toyota and Lexus

    When battery is under load it is easiest to see issues. Sitting at rest is not as helpful to look at.

    Voltage difference
    Basically want diff between highest and lowest to be very small. All similar is good. A couple's of tenths difference maximum would be nice.
    A volt or more is terrible.
    It's sometimes hard to watch this since the graph is constantly rescaling.

    IR will never be 0.
    Basically best if all similar.

    Better to have a battery where all the modules are crappy, but equally crappy, than a battery with mix of excellent modules and marginal modules. Too much difference between modules will make the car freak out.
     
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  3. atown636

    atown636 New Member

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  4. ericbecky

    ericbecky Hybrid Battery Hero

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    Call me and I'll walk you through it.

    If you feel like it, you could document it for yourself or others.

    608-729-4082
     
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  5. DinoBravo

    DinoBravo New Member

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    I have the same question ~ what am I looking at here???
    2014 prius V 5
     

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  6. ericbecky

    ericbecky Hybrid Battery Hero

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    The same reply.
    Call me.
    Then you can write it up and document it if you like.
     
  7. rjparker

    rjparker Senior Member

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    You want the voltage difference between individual cells to be low. If it was 0.4v-1.5v it might be closer to end of life. You also want the individual cell resistances to be almost equal. Yours looks reasonable.

    The rest is just realtime data that is not useful unless the battery is not working at all, typically if it sat in a junkyard for years.

    The clearer screen is the full battery test. Some believe this load test is a decent method to test the battery. However reduced mpg by 10% or more and a rapid discharge in a couple of minutes is a good indication the battery is old even if the error codes have not come up yet. 0EF4D404-934B-4240-A5B5-DDE43BE0FF19.jpeg

    Honestly all of this is meaningless unless you have the battery fail codes. Detailed cell by cell data is of questionable utility from a repair standpoint unless you were a refurb company swapping modules. Even then a simple voltmeter would be the tool of choice.

    The following pic is a good battery with a couple of years use. Typically you should get at least 8-10 years. Voltage difference is low and the cell individual resistances are equal. However even these numbers will fluctuate when the battery is loaded.
    72D526BA-A080-4EEB-8DA5-8E7ED60EBDD9.png

    On the first screenshot from post 3, you can see a higher voltage difference and a resistance difference that Dr Prius believes is out of range.
    AAFA9130-4807-4C0C-9616-A9B858DA1053.jpeg
     
    #7 rjparker, Nov 25, 2020 at 10:36 PM
    Last edited: Nov 25, 2020 at 10:56 PM
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