Gen 4 12 Volt battery.

Discussion in 'Gen 4 Prius Technical Discussion' started by padroo, Feb 13, 2018.

  1. Prodigyplace

    Prodigyplace Senior Member

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    NAPA had a direct replacement? I believe it is Japanese size.
     
  2. Mendel Leisk

    Mendel Leisk Lapsed Cargo Cultist

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    Can you post the battery's identifier stats, name, part number or whatever? Thanks. (y)
     
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  3. Elektroingenieur

    Elektroingenieur Senior Member

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    It’s a Japanese adaptation of a European size. As @padroo pointed out in post #1 of this thread, BCI now has a group number, 140R, with the same 207 mm × 175 mm × 190 mm case size and terminal arrangement.
    From the photos @KeanuMok kindly shared, I believe it’s the NAPA BAT 75140R.
     
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  4. padroo

    padroo Senior Member

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    You would think we would have the Gen 4 Prius 12 V battery all sorted out by now.:)
     
  5. Prodigyplace

    Prodigyplace Senior Member

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    That’s what @Elektroingenieur is saying. It has been sorted out by a new size designation. 140R.
     
  6. padroo

    padroo Senior Member

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    Here is a battery from Advance Auto and says it is an exact fit and it says it is a group H4, there is no mention of 140R

    Advance Auto Parts - Down for Maintenance

    The one from O'rilley auto parts store is a 140R and it says it doesn't fit.
     
    #66 padroo, Jan 5, 2019
    Last edited: Jan 5, 2019
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  7. Elektroingenieur

    Elektroingenieur Senior Member

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    Part of the problem has been that there are multiple designations and designation systems, some of which have only recently been used to describe batteries available in the U.S. aftermarket, and not all of which are used consistently by sellers. Toyota didn’t help matters with their “no size listing” statement, either, though the 2017 edition of their battery application guide (PDF) mentions the “H4” designation.

    The case size (207 × 175 × 190 mm) and terminal layout came from the European EN 50342-2 standard (successor of EN 60095-2), which also defines other sizes; that one is known as size “LN 1.” That standard was adapted for Japanese use, as previously described. BCI subsequently assigned 140R as their group number.

    At this point, I think it’s safe to say that any LN 1, 140R, or H4 battery would fit physically in a fourth-generation Prius or Prius Prime car, and most would also be suitable electrically, considering the relatively undemanding requirements. Since the battery is under the hood, a flooded (wet cell) lead acid battery, as Toyota installs, will do; an AGM battery is required only for previous models that have the battery in the passenger compartment.

    We also had a report of a successful replacement with a battery having the BCI group number 26R. This group has a similar case size, 208 × 173 × 197 mm, and could be a reasonable second choice if an LN 1, 140R, or H4 battery isn’t available.
     
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  8. alanclarkeau

    alanclarkeau Senior Member

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    I can't see why MPG would be different with 12v battery - it should be unrelated.

    When you sat in the parking lot charging your phone, did you have your car running, or just on Auxiliary?
     
  9. Prodigyplace

    Prodigyplace Senior Member

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    There have been reports of mpg affected by bad 12 volt. Likely the inverter is using extra energy from the traction battery trying to charge the bad 12 volt battery.
     
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  10. CooCooCaChoo

    CooCooCaChoo Active Member

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    It's like a flashlight using batteries that are drained and need to be replaced. You can still turn on the flashlight and it'll have enough charge to throw out some light, but not as bright as if the batteries are new. Likewise, a discharged 12v battery will still allow the car to turn on and run, but not as efficiently as a new fully charged battery.

    SM-T820 ?
     
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  11. alanclarkeau

    alanclarkeau Senior Member

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    I can understand that the inverter will be sending some power to the 12v battery to charge it. As long as there's enough in the 12v to START the Hybrid system you'll get going - and the inverter will gradually charge the 12v battery. The relatively low powered 12v battery is using only a small fraction compared with the charge in the hybrid battery and the other electrical systems going on. I can't see how it will make a difference to MPG. A hybrid battery with only 2 bars will use more MPG as it charges.
     
  12. Prodigyplace

    Prodigyplace Senior Member

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    The engine needs to run more to replace the extra electricity used from the traction battery trying to charge a 12 volt battery that never gets fully charged.
     
  13. alanclarkeau

    alanclarkeau Senior Member

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    But it's not going to be much. It's like I wonder why race-cars drive with headlights on - but I was told that it's just a drop in the ocean compared with the amount of power driving the car itself.
     
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