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How long has your original 12v battery lasted?

Discussion in 'Gen 3 Prius Main Forum' started by sardog, Jan 20, 2020.

  1. 46mike

    46mike Junior Member

    Joined:
    Nov 19, 2010
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    0
    1
    Location:
    Rochester NY
    Vehicle:
    2010 Prius
    Model:
    IV
    Still dealing with Chipmonks loving interior of my Prius
     
  2. iskoos

    iskoos Active Member

    Joined:
    Dec 24, 2017
    399
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    Location:
    Orlando, FL
    Vehicle:
    2010 Prius
    Model:
    III
    About 8 years and 10 months @ 150k miles.
     
  3. Fostel

    Fostel Member

    Joined:
    Oct 30, 2018
    87
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    Location:
    London
    Vehicle:
    Other Hybrid
    Model:
    Excel
    I am at 86k miles. The battery is 7 years old (maybe 8). It's the smaller 35 Ah version and recently sits low around 12.2-12.4V
    I was going to get a new one but instead, I will try to add some water and charge it properly. Looks like 2 more years is doable.

    On the other hand, I am going to do brake fluid change and the old battery may not be good enough with the IG-ON for that long.
    Also, it looks like I am losing mileage because traction battery got drained to charge the 12V so it may not be worthwhile.
    Plan B is to install a 55 Ah deep-cycle battery.
     

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  4. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
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    Location:
    Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    You could hook up your charger as you do the brakes.
    Should be enough to even charge the battery. It won't take 4 amps for the brakes,
    at least I don't think it will take 4 amps for the brakes....
     
    Fostel likes this.
  5. tonynap

    tonynap Member

    Joined:
    Jan 13, 2019
    43
    37
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    Location:
    NY
    Vehicle:
    2012 Prius
    Model:
    Two
    P.S. The aftermarket replacement lasted just 2.5 years.

    I did keep the OEM after I replaced it. It powered a small; inverter during a couple of power outages. It ran a phone charger, a coffee machine, and a lamp.

    It is an excellent battery.
     
  6. MGpwr

    MGpwr Member

    Joined:
    Mar 9, 2018
    80
    34
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    Location:
    Not far (enough) from Asheville, NC
    Vehicle:
    2006 Prius
    Model:
    Business Edition
    I've got two of the original Yuasa, one from a 2006 and one from a 2009, they've been powering one of my UPS for a
    couple years now.
     
  7. Steves895

    Steves895 Member

    Joined:
    Jul 18, 2016
    48
    68
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    Location:
    Concord, NC
    Vehicle:
    2015 Prius
    Model:
    Three
    2015 Gen 3. Replaced battery two weeks ago at 123,500 miles, with OEM battery from Toyota.
     
    ASRDogman likes this.