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Newpriusbatteries.com calibration.

Discussion in 'Gen 2 Prius Technical Discussion' started by LINGARAJU GOTTUMUKKALA, Aug 15, 2020.

  1. LINGARAJU GOTTUMUKKALA

    LINGARAJU GOTTUMUKKALA Junior Member

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    So my gen2 OEM HV battery finally died and I replaced with those cylindrical cells from newpriusbatteries.com and install went well with no issues and all is well fairly with few issues, first the battery bars show all green but dr.prius app shows charge as only 50 to 55% but the engine kicks in to drain the HV from getting too much charged, secondly there is not much hp generated from electric motor as engine kicks in early on in speed under 25 from start on level road, so how do I calibrate new battery so the software reads battery levels correctly. Thank you.
     
    #1 LINGARAJU GOTTUMUKKALA, Aug 15, 2020
  2. dolj

    dolj Senior Member

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    You just drive the car and the ECU will slowly recalibrate as it gets used to the capacity of the new battery.

    Dr. Prius is probably correct and the ECU will reset to 55% - 60% defaults after having the 12 V disconnected for the replacement job. The MFD will catch up soon enough, just take it out for a good long drive, up and down some hills if you have that close by.
     
    #2 dolj, Aug 15, 2020
    LINGARAJU GOTTUMUKKALA likes this.
  3. LINGARAJU GOTTUMUKKALA

    LINGARAJU GOTTUMUKKALA Junior Member

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    Yes I have been driving for about 2 days now, put on about 250 miles so far and my job as home health I have to drive lot of countryside mostly hilly around blue ridge mountains and mileage shows 48.9 and 274 miles since reset but only 3 bars in gas level shown, I recharged fully in drive mode with brake down and gas throttled all the way down until all green and engine slowed down as battery has charged but it still showing 60% only, I guess it will correct and now out of the blue I got the solid p0420 code saying catalytic converter below threshold and it has been showing check light on and off for few months now but it's solid now and I clear the code and once engine heats up and I drive again check light comes on again after few hours, those converters are costly and is there a cheaper solution to fix this and thank you once again.
     
    #3 LINGARAJU GOTTUMUKKALA, Aug 15, 2020
  4. edthefox5

    edthefox5 Senior Member

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    Not necessary to floor the gas pedal to force charge it just push the gas pedal down enough to start the engine and the charge bar to point to the battery.

    Not much from idle really. Flooring it is unnecessary stress on the car.

    I am installing a NPB system also as we speak.
     
    #4 edthefox5, Aug 15, 2020
    Last edited: Aug 15, 2020
  5. dolj

    dolj Senior Member

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    Further to Ed's post, it is not necessary at all to do a forced charge. Just let the car recalibrate in its own good time. In my experience, it takes at least two, if not three, tanks of gas for the car to work out the new capacity. The change is veeerry gradual.

    My theory is that is to do with the way the battery uses Columb counting to ascertain battery SoC rather than straight voltage.

    YMMV.
     
    #5 dolj, Aug 16, 2020
  6. edthefox5

    edthefox5 Senior Member

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    Yeah your forced charging days are over. If you need to do that your really doing too many short trips and not giving the car a chance to charge the battery. That's hard on the battery.

    Take the car out and drive it at least 15 miles at least 3 times a week maybe more.
     
    #6 edthefox5, Aug 22, 2020
  7. LINGARAJU GOTTUMUKKALA

    LINGARAJU GOTTUMUKKALA Junior Member

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    My job involves driving with multiple stops some 5 minutes apart and some 1/2 hour and some an hour apart and that's what I have been driving since installing new battery, so far it shows only 55 to 65% SOC in apps but all green bars in car display, so far refueled 3 times.
     
    #7 LINGARAJU GOTTUMUKKALA, Aug 22, 2020
  8. edthefox5

    edthefox5 Senior Member

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    yeah thats tough on the battery especially a new battery. probably hasn't gotten a real solid charge yet like a 40 mile drive. Thats what I would do take it for a nice long drive.
     
    #8 edthefox5, Aug 22, 2020
  9. LINGARAJU GOTTUMUKKALA

    LINGARAJU GOTTUMUKKALA Junior Member

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    And I live in hilly area as well and drive to my first stop from home is usually between 40 to 60 miles sometimes flat sometimes hilly back roads.
     
    #9 LINGARAJU GOTTUMUKKALA, Aug 22, 2020
  10. edthefox5

    edthefox5 Senior Member

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    I reread your posts very hard to understand. Very hard to read. Post #3 is the longest sentence ever.

    And no where do you list the mileage of the car. How hard is that to do?

    If its like 200K+ miles its probably a clogged cat killing your mileage and making the engine work very hard. Engine probably eats alot of oil.

    I would not have sunk a new battery into the car if this is the case probably needs a new engine.
     
    #10 edthefox5, Aug 22, 2020
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  11. LINGARAJU GOTTUMUKKALA

    LINGARAJU GOTTUMUKKALA Junior Member

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    My bad, it's 05prius with 204kmiles, p0420 has been going on for 2 years approximately but on/off but car was driving fine with decreased performance, HV battery fail code came on recently and dash shows full h battery but by the time engine fires up and heats in the morning battery charge would drop to red bars and I get triangle again so I had to get new battery and since I spent that much money anyway I am trying to figure out if fixing the cat with aftermarket is feasible to keep this car longer.
     
    #11 LINGARAJU GOTTUMUKKALA, Aug 22, 2020
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