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What are the Early Signs of a failing Hybrid Battery?

Discussion in 'Gen 2 Prius Main Forum' started by ski.dive, Jun 24, 2020.

  1. ski.dive

    ski.dive Active Member

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    What are the Early Signs of a failing Hybrid Battery?
     
    #1 ski.dive, Jun 24, 2020
  2. john1701a

    john1701a Prius Guru

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    MPG will drop and SOC fluctuate more.

    That aging process can take a long time though. The point of "failure" is not easy to predict. Basically, it isn't until the system detects something is outside of normal tolerances and throws a code.
     
    #2 john1701a, Jun 24, 2020
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  3. bisco

    bisco cookie crumbler

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    louder cooling fan

    reduced performance

    a/c reduction

    engine running more
     
    #3 bisco, Jun 24, 2020
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  4. Calimobber

    Calimobber Member

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    The only real signs I saw was when I came back from driving the battery would be full. A few days of the car not being driven Id get in and start the car and the battery would be in the red like 2 bars left. It would sometimes show full then jump back lower but my mileage was always pretty much the same 42mpg. It eventually threw a code so I just swapped it. I called around and got a dealer price of $1800. They let me pick up the battery and drop the old one when I was done with the swap( perks of a small town dealer).
     
    #4 Calimobber, Jun 26, 2020
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  5. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

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    asking about battery symptoms on priuschat
     
    #5 Leadfoot J. McCoalroller, Jun 26, 2020
    Calimobber and fotomoto like this.
  6. Tideland Prius

    Tideland Prius Moderator of the North
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    Lower mpg, battery draining faster than normal, engine running more often than usual to keep the battery near 6 bars. This is typical of the NiMH battery. No idea how the Li-ion ones will perform since they aren’t old enough (in the US).
     
    #6 Tideland Prius, Jun 26, 2020
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