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How Much Current Does It Take to Start a 2007 PRIUS (2nd Gen)?

Discussion in 'Newbie Forum' started by Michael Crestohl, Oct 23, 2022.

  1. Michael Crestohl

    Michael Crestohl Junior Member

    Joined:
    Jul 22, 2022
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    Location:
    Marblehead Massachusetts
    Vehicle:
    2007 Prius
    Model:
    ----USA----
    My 12 Volt battery is completely discharged after sitting unused for a few weeks, I want to jump start it but need to know if I can use a small battery do so it. I tried charging the battery in place but the charger shows about 20% then all zeros so maybe the battery is finished.……..

    This battery is supposed to be new according to the guy from whom I bought the car in September. I am concerned that the big battery might also discharge and then I might have bigger problems.

    Any advice on the best way to address this situation will be greatly appreciated.

    Thanks again for all the knowledge amd wisdom.

    Michael Crestohl.
     
    #1 Michael Crestohl, Oct 23, 2022
  2. ammdb

    ammdb Active Member

    Joined:
    Aug 8, 2019
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    Location:
    Indianapolis
    Vehicle:
    Other Electric Vehicle
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    N/A
    The big hybrid battery should be fine, since when the car is not on and in 'Ready' mode, it's physically disconnected by a relay. The 12V battery closes this relay when starting the car.

    If the 12V is completely discharged, you'll need to charge the battery before the car can even be jump started. If it won't hold a charge, it's time to get a new battery.
     
    #2 ammdb, Oct 23, 2022
  3. ChapmanF

    ChapmanF Senior Member

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    Mar 30, 2008
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    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    The question in the thread title was investigated here:

    Prius Startup Current

    which ended up suggesting you might need to source a very brief peak of 60 amps, more like 30 for a couple seconds, coming out to a total on the order of 0.025 amp-hours, or a third of a watt-hour, before the converter comes online and takes over supplying power.
     
    #3 ChapmanF, Oct 23, 2022
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