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Just picked up a quick five to eight mpg in the city.

Discussion in 'Gen 3 Prius Fuel Economy' started by ALS, Nov 27, 2017.

  1. ALS

    ALS Active Member

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    I replaced my 51 month old 12V on Friday, just saying.:)
     
    #1 ALS, Nov 27, 2017
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  2. bisco

    bisco cookie crumbler

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    were you having issues?

    what did the old one read?

    what does the new one read?

    what brand did you buy?
     
    #2 bisco, Nov 27, 2017
  3. ALS

    ALS Active Member

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    I replaced the OEM with another Toyota OEM battery. About two weeks ago I got a really strange code that didn't make sense, P0A7F. I have not seen any problems with my pack. The code has not come back so I'm pretty positive that it was the twelve volt that was pulling power off of the main pack causing the P0A7F code. I got 50-51 months out of the original 12V before it ended up dying.

    Let my add I'd pull the car into the garage at night with 7 or 8 bars and in the morning I would go to start the car and I would notice the main pack was down to 2 or or 3 bars. Since installing the new 12V, I park it after coming home from work with 8 bars and 12 hours later I still have 8 bars in the morning.
     
    #3 ALS, Nov 28, 2017
  4. Mendel Leisk

    Mendel Leisk Senior Member

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    You're thinking the hybrid battery would attempt to charge the 12 volt overnight? I'm not sure, would it do that? Maybe, don't really know. How many miles on the car?
     
    #4 Mendel Leisk, Nov 28, 2017
  5. CR94

    CR94 Senior Member

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    8 bars?! How? Live at the bottom of a big hill?
     
    #5 CR94, Nov 29, 2017
  6. ALS

    ALS Active Member

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    Sorry my bad six bars or two bars from the top or full.

    Mendel she has 72.5K on the clock.
     
    #6 ALS, Nov 29, 2017
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  7. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    Some, certainly not all, ways a 12 volt battery fails it has very low voltage. The silly DC to DC converter will try to recharge it any time it is Ready. It can use up 5 MPG trying to charge a battery with a bad cell.
     
    #7 JimboPalmer, Nov 29, 2017
  8. Mendel Leisk

    Mendel Leisk Senior Member

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    What do you think: would it also try to charge overnight, with the car off? @ALS mentions the hybrid battery state-of-charge dropping overnight. Maybe just an abberation??
     
    #8 Mendel Leisk, Nov 29, 2017
  9. CR94

    CR94 Senior Member

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    Are we forgetting that relays disconnect both wires from the big battery every time we punch the POWER button off?
     
    #9 CR94, Nov 29, 2017
  10. ALS

    ALS Active Member

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    CR94, the big pack stopped dropping over night after I replaced the 12V.

    There were mornings when I would have one bar? That was freaking me out thinking the main pack had a problem.
     
    #10 ALS, Nov 30, 2017
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