Blosted lifepo4cells
- Thread starter miran90
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timselectric
If I can do it, you can do it.
- Joined
- Feb 5, 2022
- Messages
- 20,087
Ouch
Did they come that way. Or, did you do that to them?
Did they come that way. Or, did you do that to them?
42OhmsPA
What's in a title?
I would assume they were abused.
I'm really curious what the deal is with the strap hold down and random sock...
I'm really curious what the deal is with the strap hold down and random sock...
Nobodybusiness
Solar Sponge.
That one in your hands is bad.
Never seen one like that.
Looks like overcharge.
Not had any of mine do that..
timselectric
If I can do it, you can do it.
- Joined
- Feb 5, 2022
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- 20,087
Looks like a standard strap and sock setup to me.
timselectric
If I can do it, you can do it.
- Joined
- Feb 5, 2022
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- 20,087
Alkaline
Solar Wizard
Woa, those like rept 280 cells, looks like the terminals sheered off from the expansion force. Who did you buy the cells from did you get a test report?
This package was not used heavily max voltage it had only 55.2 just for balancing its connected to other two packaged eve 105 that is now almost 3 years old this package was only 6 months old, I was surprised that when I starting to discharge them there is and issue with the capacity at 50% those 3 cells start to drop heavily. We replaced 3 cells then other 2 also were bad we had to cut the package to take them out that's why there was a strap..... the bms settings were conservative max discharge current for those cells was well under 0.25c temperature never exceeded 35c and total cycle number was under 50..
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There Is a local assembler he replaced my cells under warranty now the battery contains as he assumed 14 300AH rept cells and 2 lishen 280AH..
ScrotpusGobbleBottom
Corn Pop was a bad dude.
What a helpful kitty!
Yes very helpful ?? there is one company at the US always promoting these Rept cells and they do capacity test for one cell not for a whole package ?, and they never go under 50% for high current test.
They keep promoting those and I advise against this new company only 4 years old... I am 70% sure that those cell that i did replace have factory defects or have sit in the storage for more than 8 months the local assembler never brought those cells again..
ScrotpusGobbleBottom
Corn Pop was a bad dude.
I am sorry and sad that this happened to you. What is that low cell about? It isnt circled in the photo. 3.26- 3.0 is quite the spread! That could possibly be one at 10% and one at 60%.
ScrotpusGobbleBottom
Corn Pop was a bad dude.
yeah, your cell deviations in your photo are indeed alarming. Sorry to say.
The first 3 cells we replaced are obvious dead and their voltage show that, but I asked the company to bring additional cells to replace those 2 red circled since they also were different behavior and this voltage difference happens under 60% of capacity. Once we opened the package the other 2 bloated which are circled in red..those cells were very hard to balance at top they refuse to balance and I did balance them once I discharge then charge again the same issue they don't balance easily. I had to do many test to convince the assembler to replace them for me... for reference those eve 105 one of the best cells I've ever seen. Are connected parallel to this one.
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ScrotpusGobbleBottom
Corn Pop was a bad dude.
I would be pretty unhappy. I got mine at 18650batterystore.com and they are in fantastic shape. i think i remember .020 deviation at 3.1v when i tested last.
Alkaline
Solar Wizard
I think you have very bad grade B cells, what company are you referring to?
You should watch this video:
see how they are sanding the qr code and replacing with fake qr code.
I think all cells have the same sticker on top I bought those cells as legit grade A not used. And they are selling them as 300AH cells the package closed me 2600 USD which is not cheap. I should have gone with EVE 280k cells but he didn't have them at that time. Anyway these days eve 280k are shipped with 310 AH capacity there is a third generation cells out there
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The technician the assembly company sent tried to pull them out of the package with this strap I advised him not to do that and he stripped the terminal trying to. Then I used the cutter to cut the package bend the structure to take the cells out. He was surprised me too of how bloated those cells were... two more expanded after we opened the package. They sent me 280ah lishen cells to replace the last two and I did a video replacing them.
Nobodybusiness
Solar Sponge.
Sorry replied to wrong post.
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Nevermind dear
Look at this short
The bad cells attached with new ones that shows another 2 are bad too.
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Alkaline
Solar Wizard
Take the bad cell and remove its top black label clean and see if you see signs of sanding and relabeling.
I gave them back to the supplier unfortunately. ?
ScrotpusGobbleBottom
Corn Pop was a bad dude.
good to hear! That looked like a very bad roll
The problem is now I have 2 lishen 280ah with 14 rept 280ah rated at 300ah
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