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Traction battery rebuild at only 106k mi!

Discussion in 'Gen 2 Prius Technical Discussion' started by YY4U, Jun 16, 2015.

  1. Beachbummm

    Beachbummm Senior Member

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    I always wondered how they were numbered..thanks
     
  2. strawbrad

    strawbrad http://minnesotahybridbatteries.com

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    I am surprised that both of those modules hit a 20mv per cell delta peak. For you there is no reason to use those modules. You have plenty of better modules from your parts battery.
     
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  3. Mrez

    Mrez New Member

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    We are at 277,211 and still on our first battery pack
     
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  4. YY4U

    YY4U Junior Member

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    Congrats! That may be a record for the deep south!

    YY

    Update on rebuild: Modules chugging along slowly but surely. Most look real good.
     
  5. bisco

    bisco cookie crumbler

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    patience grasshopper.:cool:
     
  6. YY4U

    YY4U Junior Member

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    Well, it took three weeks but the car is back together and running fine. I left the rear interior panels off for a few days just in case I have to go back in, but all looks good.

    YY
     
  7. strawbrad

    strawbrad http://minnesotahybridbatteries.com

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    How many modules from your parts battery did you end up using?
     
  8. YY4U

    YY4U Junior Member

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    I only replaced #22. After changing the delta peak settings I got #7 up to 4728-7500 and #25 up to 4763-7207, which is in line with most of the other modules.

    I know there are ways to get a longer-lasting rebuild, such as matching up modules and such, but I'm not exactly sure of the theory and there is very limited info online. I did connect the modules to balance the voltages and each module was reading exactly 7.91v. Before I button up the interior I'll connect the computer and look at the voltages under load and while charging.

    Hopefully this job will last a couple of years, and if I have to go back in, I will, but the tolerances seem to be pretty generous.


    YY
     
  9. YY4U

    YY4U Junior Member

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    Well, it made it over 2 years and 40k mi. on this rebuild. Time to do it again. I've got 2 bad modules now, each reading 1 volt less than the others.

    I sold my daughter my 2014 gen3 w 29k mi, so I'll rebuild this one and sell it.

    Btw, my 2016 gen4 is spectacular!


    YY
     
  10. bisco

    bisco cookie crumbler

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    congrats, that might be a record! all the best on the next one.(y)
     
  11. Beachbummm

    Beachbummm Senior Member

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    not bad, $50 for two extra years on the car.. and they say replacing a few cells never works (Im on a year after my 2 cell rebuild still ripping along getting 44 mpg)
     
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  12. dolj

    dolj Senior Member

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    No, "they" do not say it won't work, "they" say that it won't last long. And this report is an example. While 2 years is a good effort, it is not a long term solution. If 1-2 years is what you are after, then yes, this is a (short term) solution.

    If you want 10+ years that the original battery gave plus a no fuss one time job, then a Toyota OEM is the way to go.

    Horses for courses, bud.
     
    #31 dolj, Aug 15, 2017
    Last edited: Aug 16, 2017
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  13. YY4U

    YY4U Junior Member

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    If you are reading this and trying to decide if you should try it, I would have to recommend you do not. The learning curve is just too steep. There are no clear cut directions. You will have to learn much through trial and error. If you only get 2 years out of the job, you would be much better off buying a rebuilt battery, or even a new one. The prices have come down over the years.

    If you are mechanically inclined and enjoy tinkering, then go ahead and give it a try. The job gets exponentially easier each time you do it. I tried it the first time because my family had 3 Prii and I wanted to learn. It is a simple process now, but was a nightmare the first time. See my link at the beginning of this post if you need a good cry.

    Anyone with basic skills should be able to remove the old battery and install a new one. It's the rebuilding process that will drive you insane.

    YY
     
  14. Beachbummm

    Beachbummm Senior Member

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    I call 1 to 2 years a long term fix on a 10 year old car.. ill invest $50 every 2 years to keep it alive...im not crazy enough to spend thousands on an old car to keep it alive
     
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  15. Beachbummm

    Beachbummm Senior Member

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    idk I followed the step by step instructions from a youtube video and the only problem I had was I didn't put the safety plug latch down fully .. 3 hours and the car was back on the road, drove it for a year and sold it... replaced 2 cells on my second prius drove that one for 2 years... on a year with #3 and still going strong ... maybe im just lucky only replaced 2 cells on each car and sold 2 at a nice profit
     
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  16. fotomoto

    fotomoto Senior Member

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    Except this repair is not a linear type timeframe fix like, say, a timing belt lasting every x years or y miles. This game has a built-in timer on the original pack modules and the chances of the OP getting another 2 years with only one more $50 module replacement are very, very low; in fact, he isn't since now he has to replace two modules before he sells the car.

    Like the disclaimer on financial commercials says, "Past performance isn't indicative of future results."
     
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  17. Dxta

    Dxta Senior Member

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    What happens if for instance one doesn't have a hybrid charger with such a deltaV capability?
    Can one use just voltage open circuit values as a reference for knowing the capacity(Am) of the batteries during charge/discharge?
     
  18. MTL_hihy

    MTL_hihy Active Member

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    I see you are in an area where it may be difficult to receive tools/parts but any good quality hobby charger should be able to find deltaV correctly and stop the charging process at that point. I had no issue when using my Hitec X4 setup but watch out of some of the cheaper ones like the Imax B6 which has a million Chinese knockoffs and don't perform nearly as well as the real deal. Some of the Turnigy chargers also work very well and have higher discharge rates to speed up the process too.