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Time to replace 12v battery?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by twosinks, Jul 31, 2024 at 5:33 PM.

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  1. twosinks

    twosinks New Member

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    the 12v battery in my 2013 Prius reads 11.6 volts before startup and then once I turn the car on it jumps up to 14.3v is this normal? Or is it time to replace the 12v battery? I found this information in the diagonstic menu... I assume that the information provided is for the 12v battery, and not the Hybrid battery.
    There is no trouble turning the car on and there is no signs of a dying battery like dim interior lights nor an illuminated check battery light on the dashboard.
     
    #1 twosinks, Jul 31, 2024 at 5:33 PM
    Last edited: Jul 31, 2024 at 5:46 PM
  2. Brian1954

    Brian1954 Active Member

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    How old is the 12v battery?

    You could try using a battery charger and see how the battery responds before buying a new battery.
     
    #2 Brian1954, Jul 31, 2024 at 7:25 PM
  3. Stevewoods

    Stevewoods Senior Member

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    How are you "reading the 12v number."

    Basically, if your battery is below 12.4 volts you are living on borrowed time.

    The battery needs to hold above 12.4 all by itself to be considered viable.
     
    #3 Stevewoods, Jul 31, 2024 at 7:42 PM
    Last edited: Jul 31, 2024 at 8:01 PM
  4. bisco

    bisco cookie crumbler

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    if it's original, replace it with a new oem
     
    #4 bisco, Jul 31, 2024 at 8:26 PM
    Stevewoods likes this.
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