Prolong discharge voltage changed ?

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

  1. smokeGTI

    smokeGTI Member

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    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 ?
     
  2. SFO

    SFO Senior Member

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    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?
     
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  3. smokeGTI

    smokeGTI Member

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    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.
     
  4. jerrymildred

    jerrymildred Senior Member

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    That sounds fine. At 1/3 of an amp, it takes hours and hours to fill that battery.
     
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  5. edthefox5

    edthefox5 Senior Member

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    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!
     
  6. smokeGTI

    smokeGTI Member

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    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.
     
  7. edthefox5

    edthefox5 Senior Member

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    Overnight charge does very little medicinally. Please see post #5.
     
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  8. Raytheeagle

    Raytheeagle Senior Member

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    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).
     
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  9. smokeGTI

    smokeGTI Member

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    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)
     
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  10. Raytheeagle

    Raytheeagle Senior Member

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    Sounds like you were successful:).

    Keep us posted with your data;).

    It helps others out (y).
     
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  11. smokeGTI

    smokeGTI Member

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    So far so good (y)
    Forgot to log it down, will do next time. Cheers.
     
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