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Battery Discharge & Damage (200v)

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Karis, Dec 11, 2013.

  1. Karis

    Karis Junior Member

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    I have spent about two hours hunting through PC (using search, of course) and I can't find a discussion of this, so here goes...

    I recently (2 weeks ago) was given a 2006 Prius with 122,000 miles on it by my parents. My father, while giving me details about it's history, said that the large battery might wear out in the next couple of years because it was fully discharged while climbing the Rockies a few years ago. I have never seen the meter show more than 7 bars (green), and only twice. It usually sits at either 5 or six bars. Is it likely there is some damage, and if so is there anything I can do about it or watch for in the future?
     
  2. bisco

    bisco cookie crumbler

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    no, discharging the hybrid battery is not possible and what you see on the info screen is only partial discharge and will not harm it. 5-6 bars are most common and there are plenty of threads here discussing it. you should be good for a long time and if you are in a carb state, the battery has a full 150,000 mile warranty. welcome to priuschat, and all the best!(y)
     
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  3. Robo

    Robo Junior Member

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    I have a 2007 Prius with 224,000 miles ! And to keep it charged I go down hill in the regeneration mode(b on shift lever). This will recharge the battery.
     
  4. Britprius

    Britprius Senior Member

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    The B mode on the shift stands for brake. Unless the hill is particularly long and steep there is no need to use B. The HV battery will still charge.
    Using B mode forces the engine to be spun "without fuel" to help slow the car down saving some use of the brakes, but wasting energy. However if the HV battery is below full charge (80%) using the brakes will charge it more quickly through the regen operation of the brakes without wasting energy spinning the engine until the battery reaches the 80% charge level "all green bars". Using B can increase the amount of fuel you use.

    John (Britprius)
     
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  5. usnavystgc

    usnavystgc Die Hard DIYer and Ebike enthusiast.

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    Just to reinforce what bisco said, your car is acting completely normal. There's no telling how long the battery will last. Most people on here agree that age is more of a factor than mileage but, obviously more mileage equals more charging/discharging cycles (theoretically at least although, it is also dependent on the city to hiway ratio).

    Just to give you some perspective, my 01 is still on the original battery after 12+ years and 127,000 miles. The 01-03 models were fitted with what most would say are "inferior" batteries compared to the Gen II/III.
     
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  6. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Your battery state of charge behavior is quite normal. Even when the state of charge declines to one pink bar, it is still ~40% while eight green bars is ~80%. It is certainly possible that the traction battery may need to be replaced in two years, but it also may continue to provide service for a longer period.

    There is really nothing you can do, just drive the car and enjoy it.
     
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  7. dorunron

    dorunron Senior Member

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    Like others have said, I don't think you have a problem. Actually I think you have a very NICE gift.

    Enjoy the Prius and don't worry about it. If you take care of it, it will take care of you.

    Lots of tips and tricks here on PC that will help you get the most out it.

    Best of luck to you and "Welcome to Prius Chat!"
     
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  8. uart

    uart Senior Member

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    That battery seems like it's in perfect condition Karis. Everything you've described sounds exactly as it should be. While it's true that continuous deep discharge cycles may shorten the battery's life, the occasional one like that wont hurt it at all.

    As others have said, even when the screen displays zero battery charge it still has some reserve, so it was never completely flat anyway. I think your father was probably concerned unnecessarily over the incident. It sounds like you've got a very good car. :)
     
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  9. fuzzy1

    fuzzy1 Senior Member

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    Only once? That makes it a very gently used Prius. While the battery still could go out in the next couple years, it won't be because of that single climb.

    Many of us have hit the maximum discharge that the computer allows (which as numerous others have stated, is not even close to truly fully discharged), very many times. While my more powerful Gen3s don't do it climbing the Rockies, they do in other situations.
     
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  10. Karis

    Karis Junior Member

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    Thank you so much everyone who responded to my post. I appreciate the information and support, and certainly agree that the car was a wonderful gift. That's part of why I've been doing so much reading (mostly here) about it, starting as soon as I knew I would be getting the car several months ago. I've also always been someone who wants to understand everything and likes to tinker. My first was to turn off the backup buzzer and I have plans to add the alarm that's able to be heard outside in the next week or so. That's my first project, but I'm getting more and more great ideas and many of them even seem to be within my abilities.
     
  11. butterball

    butterball New Member

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    I would say that it is typically normal for the battery of a car to be discharged fully especially being that it was given to you used with 122,000 miles on it. From what I know these type of cars typically stay on a consistent setting for the meter so I would not worry to much if I were you about it only staying at 5 or 6 bars typically. As long as there are no major problems going on with your car or making your cars not start, I would say you are ok.