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Avalon NiMH cells the same?

Discussion in 'Gen 2 Prius Technical Discussion' started by Emarian, Dec 3, 2023.

  1. Emarian

    Emarian New Member

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    Hello!

    This website is awesome! I just bought two 2nd gens and I plan on keeping them forever. I do engines and transmissions for a living so I'll be around here awhile I think

    Both have bad HV batteries. I can get a good NiMH battery out of a 2016 Avalon. Everything I can see online says the cells are the same

    1. Can anyone verify they are definitely the same and I can use the cells to rebuild my 2nd gen Prius pack

    2. If the battery is charged should I still go through the whole cq3 reconditioning process or can I slap them together by voltages and pray it works?

    My cq3 won't be here until probably at least the 15th

    I can get the Avalon pack tomorrow. Both of my priuses have red triangles of death right now I haven't even heard either of them start yet (lol)

    I suppose this will have to double as my introductory post! Nice to meet you all!
     
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  2. PriusCamper

    PriusCamper Senior Member

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    Yes... I've never heard anything to suggest the Avalon modules are different. They will work... But the amount of upgrade you get with a Project Lithium pack is more than worth the price.
     
  3. Emarian

    Emarian New Member

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    There's a lot of local junkyards in my area and when I was younger I worked for a couple of them

    I managed to get a 2013 Prius battery with unknown miles and a 2016 Avalon with 110k today. 150$ for both lol

    Both are NiMH

    So I just bought these two priuses and haven't heard either of them start because they sat for some years and HV batteries are dead

    Is it foolish to just slap together the 2016 Avalon cells in one of my packs just to see how the cars run? Or should I absolutely wait two weeks for the cq3 to get here?

    After two weeks I'd pull the Avalon battery out and go through it. Just wondering if a basic multimeter setup might work for the meantime
     
  4. PriusCamper

    PriusCamper Senior Member

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    If you have a way to charge and balance all your packs, that's the most efficient use of your time. Maybe someone near you could loan you a Maxx Volts or Hybrid Automotive charger? Or maybe build your own: https://priuschat.com/threads/build-hybrid-battery-maintenance-gear-for-under-100.224153/
     
  5. Emarian

    Emarian New Member

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    I saw that thread about building my own. I'll probably end up doing that soon, but for now I'd rather do the cells individually with a cq3. I'm about to order that friday

    I broke apart the avalon battery (34 cells inside) and all cells tested between 7.51-7.53v

    The 2013 prius cells were all 7.3v except for 4 on one end which all read less than 1v

    I assembled one battery with all avalon cells

    The other battery got all the 24 7.3v cells out of the 2013 prius battery and 4 of the remaining 2016 avalon cells. I have this battery balancing now with welders wire

    I'm fairly confident the battery with all avalon cells will work. But I'm wondering about the battery full of 7.3v cells. Will that be enough to start the engine?
     
  6. Emarian

    Emarian New Member

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    Well I got the battery in and it didn't start

    I have 209v on the input side of the SMRs

    Pulled both battery modules with the plug that tends to burn up and both are corroded horribly

    Ordered a 89890-47092

    Anyone know if this module going bad can prevent the SMRs from closing and giving power?
     
  7. dolj

    dolj Senior Member

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    Just so we are all on the same page, these are modules which are made up of 6 cells.

    A Prius battery is made up of 28 modules. The battery ECU (89890-47092) monitors the battery in pairs of modules called blocks.
    You should replace the No 2 Frame Wire (pn 82165-47040) as well. If corrosion has made it to the ECU pins, it will have wicked along the length of the wire as well.
     
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  8. Emarian

    Emarian New Member

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    There were 34 cells in the Avalon battery and 28 in my priuses. I used 28 of the Avalon cells to build one battery and combined the other 6 with the good cells out of a donor battery to make a 2nd

    You were right about the harness. Waiting for two ecus and two harnesses to get here now. Expected delivery by the 16th so hopefully I'll have good news then :)


    Edit:
    For clarification, the donor battery I mentioned was a 2012 Prius battery and it looked like the HV control module for that one exploded on the inside and all 4 of the first cells in the pack were drained to nothing

    Otherwise I wouldn't have mixed and matched. But I did balance these cells and all tested good
     
    #8 Emarian, Dec 9, 2023
    Last edited: Dec 9, 2023
  9. dolj

    dolj Senior Member

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    Again, no these are called modules not cells. These modules contain 6 cells. Your Avalon battery contains 204 cells in 34 modules and your Prii batteries contain 168 cells in 28 modules.

    The point of highlighting this is to ensure we all use the same terminology and in doing so, avoid confusion, at least here on PriusChat.
     
    Brian1954 likes this.
  10. Emarian

    Emarian New Member

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    Oh okay I understand now :)

    Thank you for clearing that up
     
  11. Emarian

    Emarian New Member

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    Well with a new 12v, rebuild HV battery, and HV ecu and harness they both fire right up :)

    Mission accomplished. I'll be sticking around I guess