2010 hybrid battery voltage question

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Vulcan18, May 21, 2025.

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  1. Vulcan18

    Vulcan18 New Member

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    I am a newbie Prius and got the dreaded Triangle of death and code P0a80. I downloaded Dr. Prius and checked the battery voltages from the app. It was obvious it was block 1 giving the main issue. Attached is the readings directly from the app. Do these voltages mean the blocks are good or are they over charging? I just got this car and since i got it the code has been present. The second module has blown and did not run any other diagnostics on the car. Can I replace modules one and two or do i just need to replace the whole battery? I sent 800 on the car and really don't have the money to just replace the battery without causing a huge strain on finances.
     

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    #1 Vulcan18, May 21, 2025
  2. Jonny23blaze

    Jonny23blaze Junior Member

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    Before buying anything, you should do a battery reconditioning process.
    I do have the prolong battery deluxe combo, charger and discarger. I am currently doing this process at the moment (may 26, 2025) and I am having an issue with the discharger is showing .000 amps on the discharging cycle, I do not know what that could be? Maybe the discharger is broken, hopefully somebody reads this thread.
     
    #2 Jonny23blaze, May 26, 2025 at 4:09 PM
  3. Brian1954

    Brian1954 Senior Member

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    Open the discharger and check to see if the small fuse is still good. If I remember correctly, when the fuse blows, the discharger will show .000 amps on the meter.
     
    #3 Brian1954, May 27, 2025 at 1:26 PM
  4. ASRDogman

    ASRDogman Senior Member

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    Time for a Sodium battery!
    Playing wack a mole will only cost you money and time.

    Since you are having such issues, not worth it....

     
    #4 ASRDogman, May 27, 2025 at 3:19 PM
  5. CatNinja

    CatNinja Member

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    @valcun18 since you already have the battery out, modules 1 & 2 can be replaced without taking the entire pack apart. This would be the cheapest (at about $35 a piece) way to possibly get you up and running. Make sure you get it from a reputable source (check this forum for a list). I got mine from a random eBay dealer and 2 out of 5 were actually worst than my existing cells.

    Unfortunately, this is just a short term fix as more and modules would fail, and you would eventually need to replace the entire battery. That said, I replaced 3 modules in my 2010 and it’s still running with no errors 2 years later.

    Reconditioning your battery would also help make it last longer, but that can get pricey ($400 and up) unless you know how to make your own.

    I would start with replacing the 2 obviously bad cells. Worth a shot at about $70 and may get you a few months until your finances improve.
     
    #5 CatNinja, May 28, 2025 at 5:07 PM
    Brian1954 likes this.
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