New 12v battery, low readings

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Ryan Romaine, May 15, 2019.

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  1. Ryan Romaine

    Ryan Romaine Junior Member

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    Car died past two days in a row. Had to jump and just.got a new 12v. This morning it's showing I'm as low as 11.3-11.4 volts in standby, and 14ish in ready. Any idea ? I can't afford this stuff, man
     
    #1 Ryan Romaine, May 15, 2019
  2. SFO

    SFO Senior Member

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    Welcome to PriusChat!!

    Always keep the vehicle "Ready" or "Off", that way the battery doesn't drain.

    How many hours per week do you drive this vehicle?

    Where was the 12v purchased, as the battery should still be under warranty.

    Ask the retailer if they charged it before the sale, or just charge it yourself.
     
    #2 SFO, May 15, 2019
  3. exstudent

    exstudent Senior Member

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    Is my inverter coolant pump slowly failing? | PriusChat
    Read Post #5 (how to apply a load for a more meaningful measurement of 12V battery health)
    Read Post #8 (Battery SOC (State of Charge) chart and 12V AGM compatible smart chargers to consider buying).​

    Is there an aftermarket accessory that is draining the 12V battery?
    Was the dome or map lights left on?
    Was a door left ajar overnight?

    Deactivating SKS will drain the less. But, sure beats the convenience of having SKS.
     
    #3 exstudent, May 15, 2019
  4. Ryan Romaine

    Ryan Romaine Junior Member

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    Not to my knowledge. The car was used, and all I can tell is some tint. Rest seems stock. I don't remember turning anything on, but will keep notice. Mechanic said after a week If the battery is dead again there must be something draining it.
     
    #4 Ryan Romaine, May 16, 2019
  5. bisco

    bisco cookie crumbler

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    disconnect the 12v negative. measure the voltage at night, and again in the morning
     
    #5 bisco, May 16, 2019
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