hybrid battery temperature

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by jerryedwards, May 1, 2025 at 10:38 PM.

  1. jerryedwards

    jerryedwards New Member

    Joined:
    Apr 20, 2025
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    Location:
    virginia
    Vehicle:
    2012 Prius
    Model:
    Four
    What is a safe temp range for the prius battery? Google says anything beyond 43C could be damaging to the battery. When I let the prius try to cool the battery off on its own it doesnt go past fan speed 2 until it hits in the low 40's, then it only goes to fan speed 3 until like 47C. When I use my prius app through the bluetooth obdii connector it forces the fan to go to speed 6 as soon as it hits high 30's to try to keep it below 42.

    Im just wondering if im being paranoid or if its good to keep the hybrid battery lower to make it last longer.
     
    #1 jerryedwards, May 1, 2025 at 10:38 PM
  2. Lares_Mat

    Lares_Mat Member

    Joined:
    May 17, 2014
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    Vehicle:
    2009 Prius
    Model:
    III
    Hi!
    HybridAssistant (an android OBD2 app) has a setting to cool or warm up the hybrid battery.
    It tries to cool down the battery if it goes over 36 degrees C (default, you can change it) and to warm it up, if it is under 15 degrees C (default as well).
    It does it by controlling the hybrid battery fan (and yes, it goes all the way up to stage 6 of the fan, you can definitely hear it working in the cabin).
    Normally, you want it comfortably tempered in your car, so it uses the cabin air to bring the battery temperature up or down. Works better if you have your air conditioning on ;)

    Mat
     
    #2 Lares_Mat, May 2, 2025 at 3:06 AM
    PriusCamper likes this.
  3. PriusCamper

    PriusCamper Senior Member

    Joined:
    Mar 3, 2012
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    Location:
    Pacific Northwest, USA
    Vehicle:
    2007 Prius
    Model:
    Two
    The cooler the battery the longer its lifespan... Some people have put a flexible pipe from the AC vent to the air intake for battery cooling fan... Alternatively getting used to driving around with AC on as cold as you can handle will help. Of course on a super hot day your AC is gonna strain your hybrid battery if you use it too much. So 'ya gotta find a balance, or just don't drive in hot weather.
     
    #3 PriusCamper, May 2, 2025 at 4:33 PM
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