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When should I replace the hybrid battery?

Discussion in 'Gen 2 Prius Main Forum' started by Dummy, Sep 7, 2024 at 10:05 PM.

  1. Dummy

    Dummy Member

    Joined:
    Mar 24, 2019
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    Location:
    Colorado
    Vehicle:
    2005 Prius
    Model:
    II
    I’ve got a 2005 with 250k miles still running the factory battery. It gets 42 mpg on the dash readout and I’ve read on here that it should be bumping 50. My math tells me that the extra 5 mpg won’t be enough to justify the cost. Today I started wondering if the slightly weak hybrid battery is putting more stress on the engine. What all should I consider when deciding to replace it or not?
     
    #1 Dummy, Sep 7, 2024 at 10:05 PM
  2. mr_guy_mann

    mr_guy_mann Senior Member

    Joined:
    Sep 3, 2020
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    Location:
    NJ-USA
    Vehicle:
    2006 Prius
    Model:
    Four
    Really, the only consideration I have is if (when) the battery starts "acting up".

    Dashboard warning lights, rapid increase & decrease on the battery gauge, big drop in mpg (by 10-15 MPG or more), engine "revving much higher".

    All of these are common symptoms when the hybrid battery is failing.

    Posted via the PriusChat mobile app.
     
    #2 mr_guy_mann, Sep 7, 2024 at 11:33 PM
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