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Prius Gen II - Dying Traction Battery Question

Discussion in 'Gen 2 Prius Main Forum' started by Woodchuck, Jan 17, 2019.

  1. Prodigyplace

    Prodigyplace Senior Member

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    Not sure if that works or not. @jerrymildred killed a battery by forgetting to wait.
     
  2. jerrymildred

    jerrymildred Senior Member

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    It should work. When I blew a cell, it was from driving it immediately. Running the A/C in neutral should work.
     
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  3. jerrymildred

    jerrymildred Senior Member

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    That's worth checking out. If the rest of the drive system is performing well, the battery can be pretty degraded and you'd still get good mileage. But it you have low tires, dragging brakes, out-of-tune ICE, or other impediments to forward motion, the best battery in the world won't do a whole lot of good.
     
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  4. edthefox5

    edthefox5 Senior Member

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    I think your not charging it long enough. You should leave it charging for at least 24 hours. It will make a significant difference. Remember the charging current is very low very limited so not to invoke heat when it charges so thoroughly charging that big pack up takes a long long time.
    You have nothing to lose except loss of the car for 24 hours.
     
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  5. Woodchuck

    Woodchuck Junior Member

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    @edthefox5 So let it charge until the voltage peaks out, and then let it go for 24 more hours?
     
  6. Prodigyplace

    Prodigyplace Senior Member

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    @Raytheeagle is somebody very experienced in the Prolong system.
     
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  7. dolj

    dolj Senior Member

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    No, charge until it peaks and then let it charge for a further 4 - 6 hours. In total that should be 24 hours give or take.
     
  8. edthefox5

    edthefox5 Senior Member

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    Hard to tell when the voltage peaks. Don't bother even looking just let it charge for 24 hours. You will be surprised how much better it gets.
     
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  9. Raytheeagle

    Raytheeagle Senior Member

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    I just keep an eye on it periodically, but my charge up cycles are around 24 hours total in length;).

    Here’s a link to by thread on the topic:

    2010 Prius II HV Battery Reconditioning

    Happy reading (y).
     
  10. Woodchuck

    Woodchuck Junior Member

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    Following up on this. I ended up re-leveling the pack by charging until voltage peaks and then added 6 hours. (About 24h in total). The improvement was not immediate, but after two weeks of driving my mileage is slowly creeping back up. I was at 35 in the city, now I've climbed to about 40mpg. We'll see how high it goes, but I'm happy with any result above 40mpg. Thanks all!
     
  11. Raytheeagle

    Raytheeagle Senior Member

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    Thanks for circling back;).

    Sounds like a longer soak worked out(y).
     
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  12. Woodchuck

    Woodchuck Junior Member

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    Longer term report: After two months of leaving my battery pack alone, I'm up to 41.1 mpg on my 08' Prius with 181,000 miles. It has the original battery. It would seem that the longer soak helped and/or just leaving it alone for awhile after reconditioning.
     
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