The 4 that looked toasted are already in the home depot recycle bin.
The look of those 4, scared me enough to bring them out to my patio immediately and left them there till I took them to the recycle bin.
Thats why I asked in this thread, if those 4 batteries looked ready to vent.
Maybe should have asked, what do batteries that are about to vent look like…? How hot does a battery have to get to vent, or can a cold battery all of a sudden just vent…? What actually happens when the membrane gets punctured by crystals,.? Will a small amount of crystals directly effect the performance of the battery, will it affect the capacity or the (ir) amperage draw capability…?
2 batteries out of the that pack looked perfect, charged up good, hold voltage, decent ir on li-500, hold the rated capacity of 2600, and work fine in lights, seems good to me, why am I wrong…? They don’t get even warm when charging now.
They started out at 3.56v, not below the 2.5v cutoff.
Sorry for all the questions guys, just want to learn…
I’ve seen the results — some years ago I found a 3.7v li-ion RCR2 cell with brown stain all around the positive end vents.
It had been stored separately in a metal storage box that hadn’t been touched for at least six months.
So, yes. It was a very old “fire”something brand cell.
Crystals will grow slowly in the reactant chemicals, and can eventually puncture the separator membrane letting the chemicals mix quickly at that point.
The image comes from a stanford.edu collection; the blogger borrowed it and wrote this caption:
View Source on the response to get the links if you want to dig deeper into the source material
Thanks Hank, interesting, good info for a nob like me…
What actually causes crystals to start growing’. Is IR a positive way to tell if a small amount of crystals are present/growing in any new or harvested good working, up to capacity, cool running, battery ?
Don’t know, can’t guess, and probably there’s big money and fame for whoever definitively answers those questions.
If you looked into the linked research articles, you’ll see that the questions you ask are being studied by people all over the world, and that’s why there’s constant change in these products. Unfortunately the fact that there are so many counterfeits and fakes means you can’t tell what’s under the wrapper, so knowing what’s possible doesn’t mean you know what you’re getting.
The 2 good’ ones seem to work/charge/look almost like new. As I said they were at 3.56v. I’m guessing the charging/protection circuit on the laptop failed and those 2 never (hardly) got used for the majority of the life of the laptop, since it would only work when plugged in says the girl that gave it to me. The charging/protection circuit looked burned badly on the top of the 4 that were toasted. The 2 good ones circuit looked fine.
There was a very distinct visual difference between those 4 toasted cells chips and the 2 good ones.
The top 1/3 of the pack looked completely different than the bottom 2/3 where the toasted ones were located.
In my Klarus xpl hi that draws 3 amps they work well. On high last nite for over an hour and still going strong…
Think I’ll drill small holes all around the base of the flash lite tube, and plug them with rubber plugs that can easily pop out and allow the lite to vent pressure without exploding… lol, jk
Guess I’ll toss those 2 seemingly good batteries in the recycle bin also, or give them to my ex in a nice light for Xmas. lol, again jk.
Modify the search string you use according to the specific information you want to find.
If you’re just doing snark, haha, funny, no need to go further off topic.
Just replying on the off chance you need more help than you’ve been getting here to find the information you need.
I wanted to read them, but not for $32. The first paragraph of article was free, very interesting and exactly on topic.
I will modify the string like you suggest and see if i can read the entire article.
Don’t misunderstand me, all info i can get on this, I find interesting and am grateful for, thanks for the links Hank.
My thinking is this: at the time that battery pack was made manufacturer probably used cells from the same batch, they usually get thousands and thousands cell in one order and then make packs out of them and 4 of those cells already failed so just this fact made other cells (that may apera to work perfectly now) highly suspicious.
Other than that, I have 10-15 of this Sony cells and they are not that impressive, they can not deliver high amps, their capacity is outdated so the question is where to use them, they are not that good for high drain lights and do you want them to work prolonged time in less demanding lights?
Don’t get me wrong, I also struggle to dispose nice looking cells, I even have some that are under 2000mAh, I don’t use them but still I didn’t throw them, In my mind they are usable, not sure for what thou, I might make a battery pack out of them one day
I hear you, guess we all think somewhat alike around here. Whats the deal with that, why do I struggle to save a $3 battery that could be dangerous. Could it be part of the flashaholic syndrome…lol
copy that paragraph into google search.often leads to a copy not behind a paywall.
and if the download button has a filename visible when you hover the button you can search it too.
