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Charge or not before HV rebuild?

Discussion in 'Gen 2 Prius Technical Discussion' started by Fivestars, May 12, 2017.

  1. Fivestars

    Fivestars New Member

    Joined:
    May 12, 2017
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    Location:
    Beaxh
    Vehicle:
    2007 Prius
    Model:
    N/A
    2007 Prius
    Triangle Christmas tree
    HV Batt fan runs immediately
    Limp mode only
    Has not been started for over 30 days

    Should I try to charge the battery before removing it for disassembly and testing; or is it better to leave it in this discharged state to get a better idea of which modules are the strongest?


    I purchased a 2007 Prius a couple of months ago. I knew that it had a bad HV battery and the purchase price reflected that. I have done a lot of reading here, and salute and thank all of you who contribute to such a great knowledge base. I have also watched the youtube videos, and now have some spare time and I am about to remove the battery to identify the cells that need replacing and to see if the pack is salvageable. I just haven't found an intelligent informed opinion on the question I posed above.

    Thanks again
     
    #1 Fivestars, May 12, 2017
  2. jeff652

    jeff652 Senior Member

    Joined:
    Feb 6, 2014
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    Location:
    Idaho
    Vehicle:
    2005 Prius
    Model:
    II
    If you know there is a bad module, then there isn't much value in charging & balancing the cells before starting the rebuild process. Load Test to find the bad module, change that block, then cycle the pack a few times to recondition and equalize the replacement modules with the rest of the pack and you should be back on the road. Can be done in 2-3 days start to finish with our products
     
    #2 jeff652, May 12, 2017
    MTL_hihy and Raytheeagle like this.
  3. MTL_hihy

    MTL_hihy Active Member

    Joined:
    Sep 2, 2013
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    Location:
    Maritimes, Canada
    Vehicle:
    Other Hybrid
    Model:
    N/A
    ^^^^^^ Spot on.......load testing is key to make sure you identify the modules that are good vs ones that fall short then load test replacements to ensure the new modules will work well and finally grid charge and do the deep discharge cycles to bring back lost capacity.
     
    #3 MTL_hihy, May 18, 2017
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