Huh?
The datasheets were created for engineers only and are not meant for use by the public. The public can’t contact application engineers either.
They depend on the engineers to create the BMS’ that prevent use of overdischarged cells. When a cell can’t be used they don’t use the cells and get their money back.
If buying loose cells then hopefully they have taken the time to learn what the low voltage cutoffs for those cells are. Which we are discussing now.
???
What was my wrong answer?
And you can’t possibly be saying that you know every standard chemistry li-ion cell can be used at 1V just because some datasheets say it’s possible.
I’m not and I didn’t say that. I said this already.
every Samsung data sheet I’ve come across says it. I imagine different chems. I don’t know which.
Your misuse of documentation and stupidly high risk tolerance does not set a good precedent and is absolutely not solid advice to follow. Stop acting as if it is. Blindly misrepresenting a few datasheets as enough to make a broad, incredibly risky statement is plain asinine and outright negligent.
What they want to do or can actually end up being able to do (almost none of use will get the attention of an app engineer IMO) doesn’t matter.
I was saying what needs to be done to get the data you’re looking for when asking if a particular cell can be used “safely” (a term the engineer will need to define) after dropping to 1V.
What statement are u believing im making?
As I mentioned before, when you use a phrase like “the datasheets say” and “yes manufacturers state” you were clearly making a broad, generalized statement that encompassed all datasheets and manufacturers.
It’s fine if that wasn’t your intention. It’s not what anyone else thought though.
Even if every Samsung cell ever created can be used (carefully) if it has dropped to 1V that is completely useless info when discussing cells from other manufacturers. It also has no bearing on what can be done with other li-ion chemistries…especially ones like LCO (“LiPo”) that are especially sensitive to overdischarge and are quite volatile compared to NMC/NCA cells and especially LFP (LiFePO4, which has different cutoffs but still has a low voltage cutoff).
All of the following are dangerous generalizations or misrepresentations.
That’s a mod of your original statements and I technically agree with it. There are unanswered real-world long term safety issues that are still of concern though.
It’s important in a public forum to also talk about how going below the recommended 2.5V (typically) low voltage limit is not recommended. Especially when we don’t know which cells shouldn’t be run when under the limit.
You might respond that you’re not concerned with this, just whether 1V operation is possible with some cells in some situations. But your original question mentioned safety and I submit that accelerated cell degradation and its affect on long term safety is part of that.
The datasheets are absolutely not the end-all for decisions to be made when pushing the performance or safety limits for a cell. Every commercial customer for these cells knows that and consults their app engineer in these circumstances to better understand the risks.
I’m not saying what we (the public) should do, I’m saying what the audience for these datasheets actually do.
Literally fuck you for saying this sentence in this thread. If anyone for some reason listens to your bullshit and then gets hurt just know it’s all on you.
You are insecure about how stupid you are on the subject. Stop trying to bring things down to your level of understanding.
Reading a data sheet can be done by anybody
.
understanding why we all agree on 2.5 v requires some kind of intuition that you don’t have
Your desperation for a simple answer just goes to show how simple you are
We really need a fully gate-kept community for battery builders. Specifically to keep people like hummie out.
if you want a well defined answer for your question, i got it @hummieee :
Just because you can, doesn’t mean you should.
I do not respect you.
Just answer the question @jack.luis
It’s an easy one. It’s hard for ur ego to submit. 100000 to one u won’t give a one word answer. Instead u will freak and start cursing. Says it all
I think you’re too stupid to understand the nuance of the answer.
To others reading. Do not try to revive a pack that has spent significant time under 2.5V. The man above has no allies in this thread taking his side. Take that as you will.
One word answers are for those who aren’t smart enough to understand nuance.
But ur wrong. U can revive a pack that has spent significant time under 2.5. It says so in the manufacturers data sheets FOR MANY CELLS. Are they wrong?
You are a failure of a builder. Nothing you’ve ever worked on has ever impressed me. No one will be looking up to you or look to you for advice.
I am no longer concerned. I won’t argue but I will try to upset you for fun if I’m bored.
@jamie @longhairedboy can we take away his master builder badge? I haven’t seen him build anything good.
That’s what I thought. 100000 to 1. You can’t answer it it’s too painful for ur ego
The self described gatekeeper has spoken. Turn away and the data sheets are here to read.
The nuances of reviving a battery cell:
If the data sheet allows it, u need to trickle charge it back, in the manor stated on the data sheet, from the lowest stated voltage on the data sheet and watch its heat and resistance and it will likely degrade its capacity.
Did I miss anything anyone? Is this a safe statement to make?
@TheBoardGarage
@ross_forp
@poastoast toast
@Battery_Mooch
@Ac53n
@ShutterShock
@fessyfoo
Go away, nobody here likes you or respects your input.