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Auxiliary Battery Random Drain

Discussion in 'Prius c Main Forum' started by PriusII&C, Dec 25, 2023.

  1. PriusII&C

    PriusII&C Active Member

    Joined:
    Oct 15, 2013
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    Location:
    San Jose, California
    Vehicle:
    2012 Prius
    Model:
    II
    The 4-month old auxiliary battery in my 2012 Prius C seems drained randomly. Once in a while it becomes hard to start the car after parking for several hours. The battery voltage is low, only around 10.5V when measured in the fuse box under the hood on the passenger side. Most of time, however, it is fine. The voltage is around 12.6V. The car is always parked the same way, so no particular use of power can explain this.

    Any ideas/suggestions are welcome.
     
    #1 PriusII&C, Dec 25, 2023
    Last edited: Dec 25, 2023
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    110,135
    50,051
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    What year is it?
    Are the connections clean and tight?
     
    #2 bisco, Dec 25, 2023
  3. PriusII&C

    PriusII&C Active Member

    Joined:
    Oct 15, 2013
    370
    130
    0
    Location:
    San Jose, California
    Vehicle:
    2012 Prius
    Model:
    II
    2012. I think the connections are clean and tight, but will check and make sure.
     
    #3 PriusII&C, Dec 25, 2023
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