Prolong discharge voltage changed ?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by smokeGTI, Mar 6, 2020.

Tags:
  1. smokeGTI

    smokeGTI Member

    Joined:
    Nov 6, 2008
    61
    27
    0
    Location:
    Hong Kong China
    Vehicle:
    2009 Prius
    Model:
    N/A
    is anyone aware that prolong has changed their bulb discharging chat ?
    As I recalled there should be discharged to 17v for the third / final discharge.
    But just now I've checked their guide, the second discharge is 101v then third is 84v ?
    Light Bulb Discharger User Guide – Hybrid Automotive

    Anyone know what's going on ?
     
    #1 smokeGTI, Mar 6, 2020
  2. SFO

    SFO Senior Member

    Joined:
    Feb 7, 2017
    5,302
    4,243
    0
    Location:
    Northern California
    Vehicle:
    2007 Prius
    Model:
    N/A
    Known situation, and likely related to some of their clientele having issues when taking the HV battery that low, or other longevity issues.

    If you've already visited 17v once before, it might be in your best interest to just follow the current updated voltage recommendations.

    Many prolong users follow a basic annual top up and or modest bottom charge as needed, without stressing the pack until actually needed.

    How many Prolong cycles has your 2009 HV battery currently experienced, and at what voltages?
     
    #2 SFO, Mar 6, 2020
    Raytheeagle and jerrymildred like this.
  3. smokeGTI

    smokeGTI Member

    Joined:
    Nov 6, 2008
    61
    27
    0
    Location:
    Hong Kong China
    Vehicle:
    2009 Prius
    Model:
    N/A
    Hi SFO, thanks for your reply. I was reconditioning my wife's 2008 gen 2.
    It's already too late when I found out, was discharged to 28v on third cycle.
    So I pulled it out immediately, and now it's in the last charging state at around 233v,
    and going up extremely slow, probably 1v every 1-2 hours.
     
    #3 smokeGTI, Mar 6, 2020
    SFO, Aaron Vitolins, Raytheeagle and 1 other person like this.
  4. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    11,517
    14,132
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius
    Model:
    Two
    That sounds fine. At 1/3 of an amp, it takes hours and hours to fill that battery.
     
    #4 jerrymildred, Mar 6, 2020
    smokeGTI, SFO and Raytheeagle like this.
  5. edthefox5

    edthefox5 Senior Member

    Joined:
    Jul 25, 2007
    10,096
    4,827
    0
    Location:
    Clearwater, Florida
    Vehicle:
    2007 Prius
    Model:
    Two
    Thats fine I went down to about 25 volts on my one and only discharge and 2+ years later running really well. I have done a basic full charge about 3 times so far in the last 2.5 years.

    What you must know is after the discharge let it sit for a while to cool off then leave it on charge for at least 40 hours. It will take that long to get balanced and full because the charge rate of .333 is very very low for such a huge pack to not allow it to heat up. Patience. Anything less than that and your wasting your time. It will really respond well if done right.

    Lastly after that 40 hour charge let the car sit for a few hours before starting it. Be aware the battery software display will not really show the full charge when first starting up. Takes a few hours driving for it to figure it all out. The reason its not accurate is the battery management system was not involved with the charging. It did not see the charging because it was done outboard. It has no idea it received a full charge.
    It will...and real soon.

    Good Luck!
     
    #5 edthefox5, Mar 6, 2020
    WilDavis, Raytheeagle, smokeGTI and 1 other person like this.
  6. smokeGTI

    smokeGTI Member

    Joined:
    Nov 6, 2008
    61
    27
    0
    Location:
    Hong Kong China
    Vehicle:
    2009 Prius
    Model:
    N/A
    Thanks guys, it sat overnight charging from 239v to 240v in the morning,
    shall I call it done ? Since I saw you guys charged it up to 250v !
    that's seems not gonna happen to my one.
     
    #6 smokeGTI, Mar 6, 2020
  7. edthefox5

    edthefox5 Senior Member

    Joined:
    Jul 25, 2007
    10,096
    4,827
    0
    Location:
    Clearwater, Florida
    Vehicle:
    2007 Prius
    Model:
    Two
    Overnight charge does very little medicinally. Please see post #5.
     
    #7 edthefox5, Mar 6, 2020
    smokeGTI and Raytheeagle like this.
  8. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    11,261
    15,499
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    Hybrid Automotive guidance is that if the voltage is stable (no fluctuation) for 4-6 hours, call it done:).

    Just don't fire it up immediately after the charging cycle and take it for a spin;).

    Let it sit at rest for at least an hour (y).
     
    #8 Raytheeagle, Mar 6, 2020
    jerrymildred and smokeGTI like this.
  9. smokeGTI

    smokeGTI Member

    Joined:
    Nov 6, 2008
    61
    27
    0
    Location:
    Hong Kong China
    Vehicle:
    2009 Prius
    Model:
    N/A
    Just pulled out the charger after the voltage stable at 240v for another 3 hours.
    And let it sat for 1 hour, then took it for a normal drive. I can see the full green bars when I start the car.
    And the car performs much better going up incline, before it would remains 2 purple bars
    when reaching the top of incline, now it has 4 blue bars.
    I have planned to do a better / longer recondition again 6 months later.(y)
     
    #9 smokeGTI, Mar 7, 2020
    jerrymildred and Raytheeagle like this.
  10. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    11,261
    15,499
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    Sounds like you were successful:).

    Keep us posted with your data;).

    It helps others out (y).
     
    #10 Raytheeagle, Mar 7, 2020
    WilDavis likes this.
  11. smokeGTI

    smokeGTI Member

    Joined:
    Nov 6, 2008
    61
    27
    0
    Location:
    Hong Kong China
    Vehicle:
    2009 Prius
    Model:
    N/A
    So far so good (y)
    Forgot to log it down, will do next time. Cheers.
     
    #11 smokeGTI, Mar 8, 2020
    Raytheeagle likes this.
(You must log in or sign up to post here.)