Bad 12V battery

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Jason Beauchamp, Oct 4, 2020.

  1. Jason Beauchamp

    Jason Beauchamp New Member

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    I’m new to the site and I’m loving all the helpful information. I just got my first Prius a 2012 model 4 and I’m trying to learn everything I can about it but I do have a question that just arose. If my 12V battery is bad or going bad can that have an effect on fuel economy?
     
  2. scona

    scona Active Member

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  3. Jason Beauchamp

    Jason Beauchamp New Member

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    Thanks for the guidance exactly what I was looking for. So far I really like my Prius and actually having fun learning about all the new stuff.
     
    bisco likes this.
  4. bisco

    bisco cookie crumbler

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    welcome!
    some say yes, some say no. the hybrid battery charges the 12v. the engine gasoline charges the hybrid battery. so there is an indirect relationship.

    all the best with your new 2012. how many miles on her? read the egr threads
     
  5. Jason Beauchamp

    Jason Beauchamp New Member

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    Thanks for the input, it’s got 85K on it and the interior is like new
     
  6. badbrakes1998

    badbrakes1998 New Member

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    Personally, I recently changed my 12v for an OEM one, mine was 10 years old and I was getting worse fuel economy, but it ended up not even being the problem and it didn't change my MPG at all. So, I think they last a pretty long time honestly.
     
  7. ChapmanF

    ChapmanF Senior Member

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    I'm at about the same latitude as Delaware, Ohio, and also replaced mine with another OEM last winter at the ten year mark.
     
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