Longer life to HV battery?

Discussion in 'Gen 2 Prius Technical Discussion' started by Gen2Prii, Nov 14, 2019.

  1. Gen2Prii

    Gen2Prii New Member

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    Is there a way to get the HV battery to charge all the way?
    1573764130059.jpeg

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  2. SFO

    SFO Senior Member

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    How many miles of the vehicle?

    Best to let the vehicle ECU maintain the charge level(s). Using the HVAC without the ICE running will deplete the HV battery.

    The only time I've had to force charge the battery was during extended climbing sessions over large mountain ranges (the Sierras).
     
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  3. Gen2Prii

    Gen2Prii New Member

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    Thanks for the reply. It has 122k.
    I'm not trying to charge it externally.
    I can't seem to get the ICE to charge the HV battery all the way.
    When the ICE cycles on and off. It only charges a few bars.

    If I put in drive with the brake on and floor the gas for a few minutes. I can get the battery meter full of green. So it seems like the battery can take the full charge but the ICE just won't stay on long enough to charge it all the way.

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  4. bisco

    bisco cookie crumbler

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    do you want longer life, or higher charge?
     
  5. SFO

    SFO Senior Member

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    Since you've brought up charging externally, it might not be a bad idea to balance the HV battery given your current mileage.

    Are you noticing any abnormal fluctuations in the HV battery charge level?
    It was designed like that, the ICE isn't supposed to charge the battery all the way. Find a long downhill if you need a full charge.
    Yes, that is forced charging. You would only do that when climbing a large hill or potentially for short term storage.

    Why do you need a full charge?

    What kind of maintenance has been done so far?

    You can DL copies of the model year manuals and or run the VIN for maintenance history at http://toyota.com/owners

    Just drive it like a normal vehicle, check the oil often, change when needed, etc.
     
  6. fotomoto

    fotomoto Senior Member

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    There are two kinds of Gen2 owners: those that have changed the HV battery and those that are about to. Which are you? :unsure:
     
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  7. George W

    George W Active Member

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    As SFO stated, it's designed to work the way you described

    . I have a slightly different question for you. In normal driving, how long does it take to go from green bars to blue bars? The shorter amount of time, the closer your HV pack is to throwing a code. I recently replaced my HV battery at 155K miles. When I was idling at a long traffic light, my Prius went from full bars to 1 bar, in only a couple minutes. Inversely, going down a long hill, the HV pack would change from 1 bar to 5 bars in under a minute.
     
  8. sam spade 2

    sam spade 2 Senior Member

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    It would NOT be economical to have it do that.
    But a really LOT of people have trouble grasping that.
     
  9. Gen2Prii

    Gen2Prii New Member

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    Thanks for the replies you guys, that's very informative. I when I casually look down at the meter while driving, I typically don't see it green.
    I'm not really sure what normal battery meter would be like or what the fluctuations would be like. I've only owned it for 6 months.
    A few weeks ago, I got the triangle and had a shop fix the HV battery, they changed 5 cells. I thought after that I would always be seeing green on the meter but still it's always low.

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  10. SFO

    SFO Senior Member

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    Normal is in the middle or above, generally speaking.
    Well, it's all down hill from here. Start reading up on DIY battery options, and or balancing gear.

    What kind of warranty did they offer, and do they have an actual physical location that you can descend on in the (near) future?

    If not to forward, which Florida entity was so kind as to liberate you from those benjamins? (strictly for archival purposes)
     
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  11. Gen2Prii

    Gen2Prii New Member

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    Ahh ok, that's good info on the meter.
    Haha well it was a friend of friends shop. He originally wanted me to have a reman. battery put in for 1300. He said he could do just the cells but didn't like to do it that way. Changed out 5 cells and balanced for $630

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    #11 Gen2Prii, Nov 16, 2019
    Last edited: Nov 16, 2019
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  12. bisco

    bisco cookie crumbler

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    green and purple are fairly rare, unless you happen to have repetitive driving situations that will cause them.

    in general, the computers keep a healthy battery around 5 or 6 bars, but they can go higher or lower depending on circumstances.
    if there's any battery warning before the red triangle, its usually rapid fluctuation of the gauge. a weak cell causes the battery to appear to charge and discharge quickly
     
  13. George W

    George W Active Member

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    After the 2nd Red Triangle appeared on my Prius, the entire pack began acting as one cell. Using Dr. Prius, the typical readings changed, from showing individual block voltages, to all 14 Blocks reading exactly the same. That was the final kicker to replacing the pack.
     
  14. Gen2Prii

    Gen2Prii New Member

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    This is the battery test I did with Dr Prius. It looks like #2 block is about to go but when I did another test, #2 looked good and it was another block that appeared low. Is it normal for the voltage to move around so drastically?

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  15. sam spade 2

    sam spade 2 Senior Member

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    NO.
    But that could mean that part of the problem is corroded connections.
     
  16. edthefox5

    edthefox5 Senior Member

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    Not necessary to floor the gas doing that really strains the whole drivetrain.

    Just gently push the gas pedal enough to turn the engine on. I do this all the time.

    Patience.
     
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