My purchase of 16 cells at Alibaba - Dongguan Lightning New Energy Technology Co,

~Yuri~

Solar Enthusiast
So, I decided to create a new topic about buying cells for alibaba.
The background is as follows.
I have not been very successful in ordering EVE slots in the Bassen. No one there was in a hurry to send me the ordered cells, all the deadlines for sending were over, and even more, and I decided that I had to return the money and try my luck elsewhere.
On this forum, thanks to him for that, I found a review about Dongguan Lightning New Energy Technology Co, and specifically about the seller / manager of Hayley miu.
I liked the review and decided to try my luck there.
Hayley is a very nice girl and I reached out to her specifically. And I was not mistaken. She offered me CATL 300-310 Ah cells. And I decided to buy them, having discussed all the details. Exactly a month has passed since the date of dispatch, and now the cells have been delivered to me to the doorstep.
The packaging is great. Hayley was great. And I wrote to her that I was ready to kiss the girl if she was a little closer.
Well, the traditional small gift in the form of a keychain in a box is very cute,
Hayley! If you are reading, thank you so much for that! We are all human and we love these little things. As we say - a trifle, but very nice.
A few photos will be below. And now I am in the process of upper balancing at 3.64 - 3.65 Volts. To then measure the full capacity of the cells. Cell resistances are within 0.158 - 0.195 mils, voltage - 3.293 - 3.295. Only one cell was below 3.270 Volts. We will examine it additionally for an increased discharge - I will make the upper balance and in 3-4 weeks we will compare it with the rest. So far, the impressions are very positive, despite a few minor dents and a slight swelling of 3-4 cells. I am still studying the topic of cell contraction. Well, the upper balance and measuring the capacity will take some time. The cells are still of large capacity, and the charger draws 40 - 45 Amperes from me.
Discharge - 20 Amperes. So you have to be patient. And to you too, to get my test results.
All good!
P.S. Sorry for the mistakes - English is not my first language.
 
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DThames

Photon Sorcerer
In the photo that shows all of the cells in a row, it appears the plastic wrapper is different color on some cells. Are these new cells? "...a slight swelling of 3-4 cells." sounds like not new.
 

~Yuri~

Solar Enthusiast
In the photo that shows all of the cells in a row, it appears the plastic wrapper is different color on some cells. Are these new cells? "...a slight swelling of 3-4 cells." sounds like not new.
My dear, it’s time to understand that the cells are new, and even CATL, you will not buy at such a price. And don't buy it at all. Cells from disassembly, and everyone who wanted to know this already knows. Everything is worth the money. Read more and more often the forum, and a lot will open your eyes. And for new cells from EVE, you can contact Amy Wan. There are topics on the forum.
But why do you need it?
 

~Yuri~

Solar Enthusiast
Well, I finished the full capacity test of cell number 3.
Discharging to 2.8 volts (95% SOC) showed that the cell has a capacity of 294.5 Ah.
If converted to 100%, the capacity is exactly 310 Ah. Strange coincidence, isn't it? Like a drugstore. I don't believe it. Here's a screen shot.
I will now put the next cell to discharge to 2.5 volts. So as not to divide/multiply.
Because according to the tables of smart people, 2.8 volts is 95%, 2.5 volts is 100% SOC.
 

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~Yuri~

Solar Enthusiast
The test of the second cell from my batch is complete.
317.7 Ah. I can only say one thing - I am satisfied.
Will be testing two or three more cells to choose from later. I don't have the patience for all 16 :)
One test goes for 15-16 hours.
The second test I limited the voltage below to 2.5 volts.
The result is below, in the screenshot.
Hayley, I know you will be reading.
Thank you so much for your purchase!
These are the kind of people you can work with. I made no mistake.
Believing in people is inspiring!
 

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~Yuri~

Solar Enthusiast
Cell #13 had a bad surprise - its capacity was 296.1 Ah. Sad, sad, sad. Since the battery is evaluated by the lowest cell capacity, I will not get a high capacity, although there are 317 Ah cells. Too bad.
I'll keep running tests. I checked cell 13 twice, in order to avoid mistakes.
I only checked 5 cells out of 16 so far, selectively.
 

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NOLA_Castle

Learning Everyday....
Cell #13 had a bad surprise - its capacity was 296.1 Ah. Sad, sad, sad. Since the battery is evaluated by the lowest cell capacity, I will not get a high capacity, although there are 317 Ah cells. Too bad.
I'll keep running tests. I checked cell 13 twice, in order to avoid mistakes.
I only checked 5 cells out of 16 so far, selectively.
What is the battery self discharge rate?
 

ArthurEld

Photon Sorcerer
Cell #13 had a bad surprise - its capacity was 296.1 Ah. Sad, sad, sad. Since the battery is evaluated by the lowest cell capacity, I will not get a high capacity, although there are 317 Ah cells. Too bad.
I'll keep running tests. I checked cell 13 twice, in order to avoid mistakes.
I only checked 5 cells out of 16 so far, selectively.
Nothing to be sad about in my opinion
 

~Yuri~

Solar Enthusiast
I'll try to show you here what compression spring tensioning device I have constructed. The photo is a test version. It is assembled for testing. And the test was successful, I am satisfied.
 

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Bob B

Photon Sorcerer
I'll try to show you here what compression spring tensioning device I have constructed. The photo is a test version. It is assembled for testing. And the test was successful, I am satisfied.
Would you please post your compression assembly over here ..... and maybe some details about the springs you used?
 

nate_syd

Solar Enthusiast
It seems you have been breaking into my garage...

If i posted up the last month of what I have been through it is EXACTLY the same...
I bought 8 cells from Hayley.... 1 was a different colour & slightly less capacity... 7 were over the stated 300Ah capacity
i also did a spring setup very similar to yours :)

So yes - Hayley was spectacular!
all cells are great & as advertised, for a superb price too.
 

~Yuri~

Solar Enthusiast
It seems you have been breaking into my garage...

If i posted up the last month of what I have been through it is EXACTLY the same...
I bought 8 cells from Hayley.... 1 was a different colour & slightly less capacity... 7 were over the stated 300Ah capacity
i also did a spring setup very similar to yours :)

So yes - Hayley was spectacular!
all cells are great & as advertised, for a superb price too.
Truly we all live in one big world, and it is one! :)
 
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