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Reconditioning HV Battery with Quattro B6 - Over Charge Capacity

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Okeno, May 22, 2020.

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  1. Okeno

    Okeno New Member

    Joined:
    May 22, 2020
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    Location:
    Fredericton, New Brunswick
    Vehicle:
    2008 Prius
    Model:
    Touring
    Hi. I'm trying to recondition and rebalance my 2008 Gen 2 Prius Hybrid Battery using a Robitronic SkyRC Quattro B6 DC multi-charger.

    I've found a couple threads here and the 45 minute video on Youtube. I've tried to follow the settings for the charger:

    NiMH Battery settings
    • Charge @ 3.0 A (first attempt) @ 2.0 A (second attempt)
    • Discharge to 6 V @ 1.0 A
    • Discharge > Charge 3 times
    • Repeak 2
    System Settings
    • Waste Time 5 minutes
    • Safety Timer off
    • Capacity Cut-off @ 7500 mAh (first attempt) @ 7000 mAh (second attempt)
    First attempt on batteries 1, 3, 5 and 7 and then second attempt on 2, 4, 6, 8. Original standing voltages were around 7.4 volts before the discharge. Voltage was closer to 8.8 or so when it was done.

    In both cases they couldn't finish the first discharge>charge cycle. The discharge appeared fine but the charge then fails for every battery with "Over Charge Capacity Limit" on the display. I can't seem to see any other details about the battery. When I went to check occasionally I never saw the mAh get close to 7000. Last time I checked before it failed it might be close to 6000 mAh and 8.75 V.

    What am I doing wrong?

    Thanks!
     
    #1 Okeno, May 22, 2020
  2. xland

    xland New Member

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    Jun 23, 2020
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    Location:
    Australia
    Vehicle:
    2006 Prius
    Model:
    III
    I could be wrong here, I have the same charger, overcharge capacity message comes up when module capacity is greater than the set capacity in settings. Eg battery hasn’t finished its charging cycle yet and has exceeded the set capacity.

    you can also just auto charge (I use 1 amp these days) then select discharge to 6.0 volts and you will always see the capacity on screen


    Regards
    X 3E98826E-7CB7-47F3-B548-8C9B33FB534E.jpeg
     
    #2 xland, Jun 23, 2020
  3. Wenjun Li

    Wenjun Li Junior Member

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    Jun 1, 2020
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    Location:
    tauranga
    Vehicle:
    Other Hybrid
    Model:
    N/A
    It seems many models are doing this. Anyone find a solution?
     
    #3 Wenjun Li, Jul 21, 2020
  4. kdfchannel

    kdfchannel Junior Member

    Joined:
    Mar 12, 2021
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    Location:
    Orlando, FL, United States
    Vehicle:
    2012 Prius c
    Model:
    ----USA----
    I am running the same problem with the new hitec x4 ac pro ( over charge capacity limit ) and don't know what setting should I use to avoid this. I have good connections too .
     
    #4 kdfchannel, Apr 15, 2021
  5. Tropic thunder

    Tropic thunder New Member

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    Aug 19, 2021
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    Location:
    Texas
    Vehicle:
    2004 Prius
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    Was anyone able to resolve this. Curious to see what could be the problem as I’m having similar issues
     
    #5 Tropic thunder, Aug 19, 2021
  6. Gino Veltri

    Gino Veltri Member

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    Dec 25, 2020
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    Location:
    80521
    Vehicle:
    2005 Prius
    Model:
    ----USA----
    up your charge capacity to 9000 sometimes, i thought 8000 would cut it but not so on two of them. It is my understanding that NiMh will deal with excess charge by 1)charging the weakest cell in the module 2) the full cells dispell overcharge as heat (aka, keep a fan on it, or the rocky mountain air in dec)
     
    #6 Gino Veltri, Dec 10, 2021
    mjoo likes this.
  7. Gino Veltri

    Gino Veltri Member

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    Location:
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    Vehicle:
    2005 Prius
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    ----USA----
    I say "it is my understanding" because it is admittedly limited. Like, I know nothing but my own experience with this charger,so take this with a grain of salt...also is it me, or my crappy multi, or is this machines voltage calibrated a little off?
     
    #7 Gino Veltri, Dec 10, 2021
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