12 volt hack for Gen 1- Gen 3

Discussion in 'Gen 2 Prius Main Forum' started by Sharnold, Oct 23, 2019.

  1. PriusCamper

    PriusCamper Senior Member

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    yes, but they are a very common battery type... I'm sure you can find one just like it in any nearby big city in your country. They're predominantly used for wheelchairs and home computer back up power supplies.
     
  2. Fostel

    Fostel Junior Member

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  3. Sharnold

    Sharnold Active Member

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    Given the fact you've basically gave us a write up over health and safety concerns you do realize that's irrelevant considering the prius battery tray is vented.
    And trust me I'd worry less about it than the HV battery considering if a cell goes bad and someone is dumb enough to keep resetting the cel to drive its a ticking time bomb. *see one of my previous posts and watch video where its literally sizzling and smoking. I've rebuilt a few of the HV batteries now that had a completely overcharged exploded cell that I'm pretty sure is much more a hazard than the lead cell batteries

    Posted via the PriusChat mobile app.
     
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  4. PriusCamper

    PriusCamper Senior Member

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    Not sure how we ended in a Gen 1 battery thread about 12v hacks and talking about HV battery venting? Lol... But the latest pack I'm working on blew up a couple balloons day before yesterday. First one was at the end of it's discharge and inflated in 1/2 second right when my face was over the top of the pack. Second one was towards the end of charging back up from 2volts. Sure am glad I take the time to put these balloons on so my tiny studio apartment doesn't fill with these nasty fumes! Also if anyone knows someone I can mail a balloon to for full chemical analysis, I'd appreciate that data.

    PXL_20201110_223855141 (1).jpg
     
  5. PriusCamper

    PriusCamper Senior Member

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    These claims are simply not true... A Toyota battery is much lower amp hours and of inferior quality compared to a $100 55 amp-hour AGM battery that are way more commonly used for all types of applications and they also cost 1/3rd the price.

    What's more there's plenty of existing venting in the 12v area without the internal vent tube which is sealed with a thin layer of plastic that's designed to blow if internal pressure builds up.

    I've need seen or read about this plastic layer being breached in order to vent and NTSB has never documented a safety concern/requirement for vented AGM when 12v is stored inside the car rather than in the engine compartment. If any of the above is something you disagree with, then please post references and links?
     
  6. ChapmanF

    ChapmanF Senior Member

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    I'm glad you've got a better selection of balloon colors now ... last time this came up they were all pink.

    Also, back then, you seemed sort of sure what they were filling with:

    That was followed by an interesting handful of posts involving sort of point-blank questions about the notion of a nickel metal hydride battery somehow giving off hydrogen sulfide gas (such as, where it would be getting the sulfur?), that did sort of end with the mail-to-a-lab idea:

    Have you had a moment since then to think a little more about the basic question there? Does it still seem like the kind of question you'd need to mail something to a lab before being able to take a stab at?

    Ok, in this thread, the other guy should be posting references and links ... while in the other thread, where somebody did post references and links, you had this to say:

    ... which really does kind of sound (passing over the sneer about presenting references) like you're claiming the level of expertise you would need for telling other people they clearly don't know anything ... about hydrogen sulfide, no less.

    Which makes me that much more interested to learn more about your thinking on the whole NiMH-producing-H₂S business. Surely you don't mean that everybody else's credibility is to be questioned but yours isn't?
     
  7. PriusCamper

    PriusCamper Senior Member

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    You present a great example of someone who's not interested in learning, but someone who's sole interest is trolling/antagonizing.

    I've been told since day one of starting this work by many people that NiMH blows hydrogen sulfide gas and too many people seem to agree that's what it is, but I really want to know more because I agree with you that they're applying lead acid chemistry to NiMH chemistry and maybe there's some similarity, but maybe not? I've spent a great deal of time trying to find out more and thanks to no help from you I've not yet found the answer. Maybe you know the answer, but I get it, you aren't here to help people, you're here to antagonize people because you think it will cure your self-esteem issues.

    As for references, wildly vague references aren't helpful and specific ones are. I was specifically requesting references for: "plastic layer being breached in order to vent and NTSB has never documented a safety concern/requirement for vented AGM when 12v is stored inside the car rather than in the engine compartment."

    I have no issue retracting my claims / statements if information becomes available that makes it right to do so... But vague referencing of thermal runaway in batteries in general rather than thermal runaway in a Prius AGM hybrid 12v that's vented or not vented is what makes a decent reference in this instance. And as I've been saying in this discussion for 7 years, I've not seen any evidence that it's ever happened in a Prius. Not even once.
     
  8. ChapmanF

    ChapmanF Senior Member

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    When you are unsure about something like that, it is really perfectly ok to say so. I say I'm unsure of things quite often, and it has had pretty much no adverse effect on the weight people will place on my opinion.

    It turns out it is really far preferable to striking a pose where you tell other people they "clearly don't know anything" about what they are trying to help you learn.

    Have you tried looking up the chemistry involved in NiMH? What did you find out the electrodes were made of? How about the electrolyte?
     
  9. RickyV12

    RickyV12 Junior Member

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    My 07 prius has one problem that I hate but not sure how to fix it, If rear hatch is not close tight, It will drain all power on 12 volts battery in day, Jump connector under hood is near damaged meaning that it happen so many times by previous owner.
    Anyway, original battery is too expensive, I find a cheap AGM battery, I modified connector and it works well for 1 year now.
    my question is that, It has 200V Hybrid battery with DC to DC converter with limited 4A output, Do they have Hacked method from panel screen to start car?
     
  10. ChapmanF

    ChapmanF Senior Member

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    No. There are relays built into the traction battery that keep it completely disconnected when the car is off. Power from the 12 volt system is needed to power the car's computers to decide that starting the car would be safe, and send power to those relays to connect them. (That's really what "starting" a Prius amounts to.) So getting help from the traction battery to start the car would be an egg from a chicken that hasn't laid it yet.
     
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