Gen 4 12 Volt battery.

Discussion in 'Gen 4 Prius Technical Discussion' started by padroo, Feb 13, 2018.

  1. tennispirit

    tennispirit Junior Member

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    Hi all, I've read all of your posts in this thread since I have had problem with my 16 Prius' 12v battery. Just want to contribute the quote price from my dealership I got this morning: $350 for the 12v battery with only 1 year of guarantee, and they don't even have it. As far as I know, most dealerships in my area (San Diego, CA) do not have those batteries in-store. So as you can imagine, it's a pain in the butt just to find one, let a lone finding an affordable battery. But thank you for all of the good information, I am going to look for an EverStart in my local Walmart.
     
  2. L Long

    L Long Junior Member

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    Re "... I can't tell how fast the battery is spinning the starter ..." - that's because it doesn't spin the starter ever.

    I'm very well aware that ".... it doesn't spin the starter ever", that's the point I was making.The reason batteries have a CCA rating is that a battery's condition can often be determined by how rapidly the starter cranks a cold engine, but of course this is not possible in light of the way the ICE starts on the Prius and why I could not determine how the battery responds to a heavy load like spinning a starter.

    I did a bit more testing today and have determined that the 12 vdc battery is most likely defective as after a full charge it immediately drops below 12 vdc simply by bringing on the headlights which is a relatively low amp load.

    I'll see what the dealer says when they do a test with their equipment to determine if they will replace the battery under warranty.
     
  3. Mendel Leisk

    Mendel Leisk Senior Member

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    Electronic battery testers still test CCA, and regardless of the car not using the battery to turn the engine over, CCA is still a good indicator of the battery's health.
     
  4. L Long

    L Long Junior Member

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    In my experience with testing batteries, which has been professionally over the past 35 years, the only reliable way to test a battery is to put an actual load on the battery, which electronic battery testers do not do.
     
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  5. L Long

    L Long Junior Member

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    Great video, many thanks Alan.​
     
  6. L Long

    L Long Junior Member

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    After watching the video that Mendel posted, (thanks Mendel), I'll have to reconsider the value of the new generation of conductance testers. However, in the video it shows the use of an inexpensive load tester similar to the one rated at only 100 amp that can be bought at Harbor Freight for about $20. What I was referring to was a high quality load tester that can put an actual load of at least one-half of the CCA rating of the battery. Since a quality load tester with this capability will be much more expensive than what most of us want to spend, the new conductance testers may be a good alternative and something to have, at least for those of us that are somewhat obsessive/compulsive about monitoring our batteries and charging systems.
     
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  7. Chris Wolfgram

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    Maybe someone can tell me.... If a 12 volt battery physically fits the space, and you can hook the cables to it, wont that suffice ? In both my F150 truck, and in my Hyundai Accent, I have been using very cheap ($49) but not bad at all Wal mart batteries. Couldn't the smallest of those be made to work ? Whats the problem ? Terminal placement ? Bet I could adapt them.... In fact you better bet I will, if it comes to the difference between using a $49 battery, vs a $350 one.
     
  8. bisco

    bisco cookie crumbler

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    since the 12v is now under the hood, my only concern would be that it is designed to accept the specific charging parameters of a prius.
     
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  9. Mendel Leisk

    Mendel Leisk Senior Member

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    @Elektroingenieur has researched compatible 12 volt batteries for fourth gen; here's some links he posted earlier in this thread:

    Gen 4 12 Volt battery. | Page 2 | PriusChat
     
    #129 Mendel Leisk, Oct 25, 2019
    Last edited: Oct 25, 2019
  10. ice9

    ice9 Active Member

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    Is there any reason, other than form-fit, that would prevent you from installing a long-life battery with GREATER Amp-Hour capacity? If not, then I would think you could install one with modification of the mounting hardware.
     
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  11. DonJuan1943

    DonJuan1943 Member

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    Gentlemen; thanks for all of your input(s) on battery life for the 2016 Prius 3 (under the hood) battery. This is my third Prius (2010, 2013, and now 2016). My current 2016 would be old enough for me to upgrade, but I like this one so well, that I'm going to keep it for a while longer (only 25000 miles, and I prefer CD the player on the top of the line stereo/speakers). But, my neurosis is this: I want to be proactive on the battery. If it's a six year battery, I want to replace it a five years. In my experience, batteries don't "show signs of going bad". "They just go bad!" And they just go bad at the worst times possible. And they look up at you and they say, "Dude! I've just gone bad, and there's not a goddam thing you can do about it"! So, enough of my poor ability to portray comedy/drama. My conundrum remains: If my original is a four year battery, then I'll replace it now. If it's a five year battery, I'll replace it next year. I've delved deeply into the bowels of the bureaucracy of Toyota Inc. as I care to; and I cannot find an answer. Surely in the fraternity of owners there is someone who can point me in the correct direction.... Thanks brethren!!
     
  12. Prodigyplace

    Prodigyplace Senior Member

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    When my son had his 2005 Prius he chose to proactively replace the 12 volt battery after 8 years. He never had a problem but did not want to be stranded because of an old battery.
     
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  13. alanclarkeau

    alanclarkeau Senior Member

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    I'm not so sure that it will go suddenly - it's a wet cell lead-acid battery, not gel or AGM. It's one of those things in life which you can never be certain of - but replacing it at 4 years just in case is something I'm not considering - just in case. As I said previously, I sold my previous car, with a 5½ yr old battery going fine in winter, the car before, I know the person who bought it at 4¼ yrs old and it lasted about 18 months - idle for up to 3 weeks at a time.

    And PRIUS Battery doesn't actually start the car - hence it isn't subjected to the high amperage load that a normal battery encounters many times a day.
     
  14. Elektroingenieur

    Elektroingenieur Senior Member

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    I’ve posted before about the warranty period: like most other parts of the car, the originally-installed auxiliary (12 volt) battery is covered for up to 3 years or 36,000 miles, whichever comes first.

    I’m sure Toyota had design objectives for battery service life and imposed requirements on their suppliers to this end, but those standards are proprietary, and more importantly, they don’t translate directly into the warranty period, which is also determined by the acceptable cost of warranty and other commercial factors.

    Indeed, I wouldn’t assume that there are any differences in design or failure rates between “four year” and “five year” aftermarket batteries, as much as sellers might like you to believe otherwise. Batteries with longer warranties sell at higher prices, allowing sellers to absorb the cost of replacements further into the cumulative hazard function and still make a profit. It’s a classic price discrimination strategy.
     
  15. Prodigyplace

    Prodigyplace Senior Member

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    Pay me now or perhaps pay me later.
     
  16. kithmo

    kithmo Couch Potato

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    If it ain't broke, don't fix it. ;)
     
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