Hybrid battery numbers help needed

Discussion in 'Gen 2 Prius Technical Discussion' started by Amarprius, Sep 15, 2020.

  1. Amarprius

    Amarprius New Member

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    i had a bad cell in my prius i replaced the cell and used a charger to charge the cell to match the voltage to rest of pack
    I had a issue where it seemed like the pack was overcharging and i pulle the back again the cells were at 8 volts
    I let the pack sit for few days it came down to normal voltage i then did a load test using a bulb and measured before and after 120 seconds
    First all the beginning volts were from 7.62 to 7.71 and just one cell the one that was replaced at 7.76 after the test volts ranged from 7.31 to 7.55 and changed the cell being at 7.58 here is the cell differences so like cell 1 7.65-7.49 16
    1. 16
    2. 17
    3. 20
    4. 20
    5. 21
    6. 27
    7 27
    8 28
    9 31
    10 30
    11 24
    12 22
    13 18. Changed cell
    14 29
    15 20
    16 19
    17 23
    18 24
    19 22
    20 24
    21 23
    22 23
    23 21
    24 22
    25 21
    26 19
    27 16
    28 16
     
  2. dolj

    dolj Senior Member

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    This is not unusual, quite normal actually. As long as they are playing nicely with each other, I wouldn't worry. When you install the pack ensure you reset the battery ECU by disconnecting the 12 V battery for 10 seconds. This will force the battery ECU to recalibrate itself.
    The generalized nature of this data means we cannot really glean anything much from it.
    You mean 0.16, 0.17, 0.2, etc. So like this:

    Module No Voltage Difference Notes
    1 1 0.16
    2 2 0.17
    3 3 0.20
    4 4 0.20
    5 5 0.21
    6 6 0.27
    7 7 0.27
    8 8 0.28
    9 9 0.31
    10 10 0.30
    11 11 0.24
    12 12 0.22
    13 13 0.18 Changed cell
    14 14 0.29
    15 15 0.20
    16 16 0.19
    17 17 0.23
    18 18 0.24
    19 19 0.22
    20 20 0.24
    21 21 0.23
    22 22 0.23
    23 23 0.21
    24 24 0.22
    25 25 0.21
    26 26 0.19
    27 27 0.16
    28 28 0.16

    Modules 6, 7, 8, 9, 10, and 14 might be worth watching but other than that this data does not show anything of concern. The modules are not perfect, but they are old so no one would expect perfection.

    A better test would be to run Dr. Prius or Torque Pro while (someone else is) driving and observe individual max/min voltages under load (fast acceleration, medium braking) as reported by either of those apps. If the voltage difference between the highest and lowest block exceeds 0.3 V, then you will have problems you need to investigate.
     
    #2 dolj, Sep 16, 2020
    Last edited: Sep 16, 2020
    SFO likes this.
  3. Amarprius

    Amarprius New Member

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    Thanks i have dr prius i will plug the battery back in and see how it goes
     
  4. Amarprius

    Amarprius New Member

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    I put the pack in ran dr prius and i tried driving the car on battery power only so it drained it did that i also had the headlights on when the car got to 2 bars the triangle came on and i got p3017 and p3024 heres all the pics
     

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  5. Amarprius

    Amarprius New Member

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    Any help masters of the prius battery? Or anyone in the bay area i can take my pack to for help? Or would a prolong charger fix my battery?
     
  6. mr_guy_mann

    mr_guy_mann Junior Member

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    Not a battery master but I do have a couple questions:
    1) did you clean all battery connection studs and replace the (corroded) bus bars?
    2) did you use a torque wrench to tighten the connection nuts?
    3) did you check for corrosion at the battery ecu connector?

    Your problem COULD be a connection issue or is more likely that you have old battery modules (same age and use as the one that failed) and you are now playing "whack-a-mole".

    Others with more experience will have to chime in about how effective the Prolong charger is when used on a pack that already has faults.
     
  7. Amarprius

    Amarprius New Member

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    I just bought another pack yesterday a used one i think my old pack was just getting old its already been worked on by previous owners, looks like it needed to be taken back in the same month a few different dates were written on it, i still want to buy a prolong just pricey
     
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