Time to replace the aux battery?

Depends on how long the fix lasts.
If the time is measured in years, then I think your "logic" fails.

This thread, and others like it, reminds me of another forum a few years ago where an equally stubborn member was at odds with most everybody on the forum about some mechanical issue and kept stating that he has been a mechanic for 40 years. After a bit, someone showed up who knew him and "clarified" his work experience: He had been a tire changer at a Goodyear store for 40 years.

And for about the 10th time I think: Just because YOU haven't seen something, doesn't mean that it doesn't exist.
Especially when several other people are telling you that it DOES.

I've stated my qualifications on here before. I KNOW things electrical.
It appears that several others here do too.
You, OTOH, are just spewing crap and doing nothing to enhance the usefulness of the forum.

 

That is true. And from where does the power come to supply the DC-DC converter?

 

Hybrid battery.

Facts are more stubborn than even ignorance.

 

And how is the energy generated to store in the hybrid battery?

 

Your logic is backwards. How would that make the battery affect the engine?

 

I don't see how you can say that, but stick with me and I'll get there. How is the energy generated to store in the hybrid battery?

Also, I asked this question back bit, which you haven't answered:

So if the 12V battery is low, does the car care enough to charge it?

 

If aux battery (even one of its cells) is losing charge by itself Prius has to charge it up every time. If aux battery has shorted cell then Prius is charging battery but since rest of the cells are full battery is just going to heat up.

Dc-dc converter that charges aux battery takes power from hv-battery and that takes it power from mg1 or mg2 and they get there power eventually from engine. All of that chain is losing even more power.

 

Awww, you stole my thunder.

 

"some men you just can't reach"

 

Maybe I'm slow, but I think I'm being had here. It's like a trolling game I guess, to get me to keep responding to the same mindless question over and over.

Good job, had me going for a long time.

 

I guess you're right. Oh well, I tried.

 

I'd love to be "reached" but assertions without basis just don't cut it, sorry.

I played fair, refuted your arguments with evidence and rationale, but all I got in return were the same flawed, empty assertions. I did my best.
Sorry if that puts me in the "wrong" in your books. Not in mine

 

I'm sorry, but did I miss that post where you "refuted [my] arguments with evidence and rationale". I was (and still am) hanging out for the opportunity to learn why my observations and conclusions are wrong. The ball's in your court.

 

I'll drop it if you will. Nothing will be accomplished if all the ground has been covered. I judge that by the number of times I've gone over the same issue.

 

I am not fussed either way, I am always willing to learn. The only one "wrong" in my books is someone who claims to have knowledge, but is then not willing to share that knowledge with the community.

If you've gone over it in other threads, do you have links to them?

 

Look, hasn't this gone way too far? What's more to share?

Based on a ton of practical experience, I can see absolutely no reason why a 12V battery would affect the performance of a vehicle, Prius or non-Prius. OK, that's the "opinion" part. Opinions are fine, but they don't prove anything. We can take a vote based on opinions, but that doesn't determine what's true or false.

Logically, it doesn't hold up either. A myriad of things can affect performance; plug gaps, valve timing, oil viscosity, you name it, but the 12V battery? There's no mechanism to explain it.

Furthermore, I can't find any empirical evidence or research to support a claim that the 12V battery will effect performance, aside from the extreme and rare case where the battery is drawing many amps from the charging system, which could only dissipate as heat, if the laws of physics are still in effect. That much heat in the battery would probably cause smoke or fire. It's very uncommon.

This is getting really repetitive and pointless. Is there anything wrong with agreeing to disagree? I'll do that, because I'm sure as hell not convinced of the contrary.

 

As far as I am concerned, it hasn't, because I find that you have not offered me any explanation of why I'm wrong. All you have told me is you can't see why it is so or that you don't believe it is so, statements you have again made in this next paragraph.

I think you are confused as to what I'm saying, because I have never actually said that the 12V battery would affect the performance of a Prius with performance defined in the way you describe it in the next paragraph.

The only real point I'm trying to make, and cannot understand why you find it hard to make sense of, is that if a 12V battery is in a poor state such that it is under constant charge by the car, then it stands to reason that there will be a greater fuel burn when compared to a car in which the 12V is in a perfect state of health.

If you believe this to be an incorrect understanding, then all I would like you to do is tell me why you believe it is incorrect.

 

If I appear stubborn, it's because I'm not convinced by your assertion. Until we can cough up some empirical data, it's just two opinions butting heads.

I can't find it; you haven't found it, maybe no one has ever tested that theory, because it makes no sense in the first place.

 

Except as I have tried to tell you, I have observed better fuel economy in the tanks following installing a new 12V battery when compared to before, as well as other improvements in drivability.

This has also been observed by others.

It makes perfect sense to me, tell me why it does not make sense to you?

 

I have been on this forum for years, and I have rarely seen anything like this. I have a great idea, start a Prius, then disconnect the 12 volt, and drive around without it. If it has no bearing on performance, mpg, whatever, report back with your findings...