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High voltage battery usage while sitting with headlights on

Discussion in 'Gen 2 Prius Main Forum' started by Ron63, Apr 7, 2020.

  1. Ron63

    Ron63 Junior Member

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    I have a 2009 Prius..when I am stopped for a train I noticed in a little while that my battery indicator goes down to purple area and my ICE starts up to recharge it..it takes a few minutes to go back to blue but it discharges faster with the headlights and a/c on...is that normal? I thought the 12 volt battery helps with accessories and I have replaced it a month ago. When I start driving it will quickly charge up and slowly go down as it is needed. Most of the times in the green area.
     
    #1 Ron63, Apr 7, 2020
  2. valde3

    valde3 Senior Member

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    12V battery is charged from hybrid battery. So all the energy that you use from 12V system comes from hybrid battery if Prius is in Ready and engine isn't running. AC uses energy from hybrid battery directly so that makes the hybrid battery bars go down even faster. So that's all normal.

    But if your hybrid battery goes down faster than normal and then charges up faster than normal that probably means it's starting to go bad.
     
    #2 valde3, Apr 7, 2020
    Data Daedalus, jerrymildred and SFO like this.
  3. bisco

    bisco cookie crumbler

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    hard to say without a video, but sounds normal
     
    #3 bisco, Apr 7, 2020
  4. frankv64

    frankv64 Junior Member

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    Its normal
     
    #4 frankv64, Apr 18, 2020
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