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Hv battery pack advice

Discussion in 'Gen 2 Prius Technical Discussion' started by Siber Pir8, Apr 25, 2019.

  1. Siber Pir8

    Siber Pir8 Junior Member

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    [​IMG] Hey guys a few questions about the state of my hv battery.
    1. My eml has illuminated a few times with the red triangle of death. My car is usable still, it just charges and discharges quickly. Here is a screen shot of my cells. Looking at the lowest value, would you recommend the change the pair of cells for block 5?

    [​IMG]
    2. Are the cells numbered starting at number 1 from the ecu end?
    I will then plan to use the prolong charger and discharge to rebalance the pack.
    Thanks
     
    #1 Siber Pir8, Apr 25, 2019
  2. SFO

    SFO Senior Member

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    Images didn't come through for me (are they hosted on FB?).

    Answer to #2 : The opposite is true for Gen2.

    How many miles do you have now?
     
    #2 SFO, Apr 27, 2019
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  3. 2k1Toaster

    2k1Toaster Brand New Prius Batteries

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    whack-a-mole.jpg
     
    #3 2k1Toaster, Apr 27, 2019
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  4. Siber Pir8

    Siber Pir8 Junior Member

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    I have attached the image as it was hosted by imgur
     

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    #4 Siber Pir8, Apr 27, 2019
  5. Siber Pir8

    Siber Pir8 Junior Member

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    So you are saying block 1 is furthest away from the ecu?
    I have 136k but had a reconditioned battery fitted about 1.5years ago.
     
    #5 Siber Pir8, Apr 27, 2019
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  6. jerrymildred

    jerrymildred Senior Member

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    That’s the problem. You can change bad cells every few months or put in a new battery and drive it another 10-15 years. Reconditioning is very very temporary.
     
    #6 jerrymildred, Apr 27, 2019
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  7. Siber Pir8

    Siber Pir8 Junior Member

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    So I have pulled one bad cell from my pack. My bus bars are quite corroded with surface rust. Once I have cleaned them and rebuilt it, could I put a thin coat of grease over them? Would it effect voltage readings?
     

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    #7 Siber Pir8, May 2, 2019
  8. Skibob

    Skibob Senior Member

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    That much corrosion in a year and a half? Or did the previous rebuilder do a crummy job?
     
    #8 Skibob, May 3, 2019
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  9. ericbecky

    ericbecky Hybrid Battery Hero

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    Yeah, if previous person cleaned them it could have that much corrosion.

    How much did this Used battery cost?

    Yes looks like you need to deal with block 5.
    Looks like this is from a Gen 2 Prius (2004-2009), so #1 is farthest from computer.

    Please use a torque wrench when tightening the module nuts as well as the nuts on the High Voltage leads.
    Not using the proper tools is kinda lazy and can cause a fair amount of damage.
    Seriously. Get the right tool. It's not that expensive.
     
    #9 ericbecky, May 3, 2019
  10. Siber Pir8

    Siber Pir8 Junior Member

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    It cost nearly £400 from from eastern Europeans so they probably did a a shitty job. But doing the job, I have discovered a water leak from the rear piller dripping down into the battery tray, so the excess moisture probly hasn't helped.
    I colleague at work who is an electrician, said I could coat them in vasaline as it is inert. Would this be OK?
     
    #10 Siber Pir8, May 4, 2019
  11. Siber Pir8

    Siber Pir8 Junior Member

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    Sorry to revive this thread.
    I repaired the dodgy block 5, only one cell out of the pair was crap and it was bulging out of the sides.
    I cleaned the bus bars, but after a few months I have a similar problem again, every now and then my battery level drops from full to empty in seconds the relays click and the engine management light comes on. The car still drives fine and eventually the battery will start to charge up again but I have to reset the light.
    Could you check my screen shot of the cells as I cannot see a bad one that sticks out.
     

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    #11 Siber Pir8, Aug 17, 2019
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