12-Volt Battery Poll

Discussion in 'Gen 4 Prius Main Forum' started by Colorado Boo, Jul 20, 2021.

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  1. 4-Years

    4 vote(s)
    18.2%
  2. 5-Years

    1 vote(s)
    4.5%
  3. 6-Years

    3 vote(s)
    13.6%
  4. 7-Years

    0 vote(s)
    0.0%
  5. Other (Leave Comment)

    14 vote(s)
    63.6%
  1. Diemaster

    Diemaster Active Member

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    Im sure theres studies on this somewhere (on here?) but i'd put my money down that the 1-3 gen, with the 12v battery in the trunk, last longer, than the 4th gen under the hood.
     
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  2. alanclarkeau

    alanclarkeau Senior Member

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    Under the bonnet of a PRIUS is never all that hot - I've opened it after a long Motorway run - compared with some previous cars which you could nearly get heatstroke from the heat radiating from under their bonnet.

    But yes, in the boot would be cooler.
     
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  3. The Professor

    The Professor Senior Member

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    I got mine replaced under warranty at about 3.5 years old. It ran flat a few times over various lockdowns, then after a -16C day in February it couldn't keep a "full" charge for more than a day.
     
  4. jcbelisle

    jcbelisle New Member

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    I bought my 2016 Prius Four Touring as a Toyota Certified Pre-Owned vehicle. I drive it almost every day. In April 2021 my 12V battery died. Assuming it was the original battery it lasted 4 years. My dad has owned Prius's since the first Gen. and has only had to change the 12 V at the 10 year mark. This Wednesday the car would not start again... the 12V is still under warranty. The car was parked at 8:00 pm Tuesday night and I attempted to drive to work Wednesday at 6:45 AM, so in less than 12 hours the battery was dead. The dealership says the battery needed a full charge and that they have no idea how this would happen at only 4 mos. and the only advise they can give me to prevent it from happening again is to be sure I drive it every day... So apparently I'm not allowed to sleep... It seems from these discussions that Toyota has designed a parasitic draw on the battery, knows this and has no intention of correcting this design flaw.
     
  5. fuzzy1

    fuzzy1 Senior Member

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    Your particular case of battery failure is not a parasitic draw design flaw of the car.
     
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  6. sam spade 2

    sam spade 2 Senior Member

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    Of course it does. But that wasn't the discussion.

    Simply being exposed to cold does NOT shorten a batteries life span........unless you are near the end to start with.
     
  7. sam spade 2

    sam spade 2 Senior Member

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    And it seems that your analysis of the situation is flawed.
    Even new batteries go bad. Maybe it never was fully charged to start with.
    Maybe YOU have a device running that is causing a "parasitic draw".
    A design flaw is WAY down near the bottom of the list........since there are literally millions of users who aren't having that problem.
    Even the examples that you provided don't support that conclusion.
     
  8. bat4255

    bat4255 2017 Prius v #2 and 2008 Gen II #2

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    '08 replaced 12v in 2018, so 10 years.

    I should have replaced it a year earlier.
     
    #28 bat4255, Jul 22, 2021
    Last edited: Jul 22, 2021
  9. robsnyder20

    robsnyder20 Active Member

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    3 years for the piece of crap factory OEM 12v. Over mileage limit of 36k so I payed like $210 installed at the dealer. However the new battery has a much higher CCA capacity (like 450) compared to the tiny capacity (210 or something like that) of the original that came from Japan. In another note I had good luck with the toyota batteries in my other vehicles so I believe this one should hopefully last for the next 6+ years easily.
     
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  10. alanclarkeau

    alanclarkeau Senior Member

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    This was original
    upload_2021-7-23_15-49-43.png
     
  11. fuzzy1

    fuzzy1 Senior Member

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    To a cold winter climate user, what good is a battery that no longer has enough cold capacity to meet the engine starting needs of his cold winters, but has several more years of life left for a milder climate somewhere else? For his cold winter needs, it is just as good as dead.

    And yes, this most definitely is part of this thread's discussion.
     
    #31 fuzzy1, Jul 23, 2021
    Last edited: Jul 23, 2021
  12. jzchen

    jzchen Senior Member

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    Different battery so deleted...
     
  13. jzchen

    jzchen Senior Member

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    Oops. Didn't realize. Deleting my prior post...

    moto g(7) power ?
     
  14. sclevine

    sclevine Member

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    Replaced at about 4 years in - at 140,000 mile service. Didn't have an issue with it, but dealer suggested replacing based on testing it.
     
  15. sam spade 2

    sam spade 2 Senior Member

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    You are trying to put words into my mouth that I did not say........again.
    Somebody said that cold would reduce the life of a battery.
    I said that is NOT true.......and it is not.
    I never said that one near the end of it's life wold not be a problem in the cold.
    DID NOT.
    Stop twisting the facts just so you can throw crap at me.......again.
     
  16. fuzzy1

    fuzzy1 Senior Member

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  17. Colorado Boo

    Colorado Boo Member

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    Alan: I wasn't asking for my 21 Prius, was asking for my wife's 2017 Prius 12-volt battery.

    Not to go too far off topic, but about 15 years ago, I had a co-worker her in Colorado accept a job up in the heart of Alaska, at Fort Greely (near Delta Junction, the end of the Alaska Highway)

    Anyway, he decided to keep and drive his Prius and we were all concerned how it would run since they can get down to -60 F there. He did have the normal plug-ins installed (block heater, 12-volt battery heater, radiator heater). During the winter, we'd watch the weather and ask him how it ran...NO problems at all! His only problems were when it would snow more than a few inches but that was only in Nov/Dec, the rest of the winter there it's actually too cold to snow. We were all surprised and amazed....Toyota knows what they are doing!
     
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  18. Ozark Man

    Ozark Man Member

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    The previous owner replaced my 2017 at a dealer because of a dead cell at 3 years. It was a corporate vehicle with only 22,500 miles when I got it in March of this year. So I'm assuming it wasn't driven much because of covid. I don't drive much either so I keep a battery tender on it so I can, hopefully, beat the previous one's time.
     
  19. royrose

    royrose Senior Member

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    I'm at 7 years with a replacement from O'Reilly's in Colorado. AAA tested it at an event a couple of years ago, said it was in great shape. I carry a compact jump starter in case.
     
  20. douglasjre

    douglasjre Active Member

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    9 yrs av 4 Prius owned. 16 friends w same car, similar results
     
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