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Shenzhen Luyuan - Did I get what I paid for?

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HighVolt

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Oct 20, 2020
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I have now purchased 54 280 A Eve cells from Amy @ Shenzhen Luyuan in the last 12 months.

The first 16 were the received in October last year and were the original version with threaded terminals. I paid extra to have them tested before they left China and the data testing sheets showed 278-281Ah with the majority testing at 279Ah. Cost per cell was US$82. They shipped the cells before the test reports were made available to me, so I had no opportunity to accept or reject them. When the data was made available to me I questioned why the cells were under capacity but I was told they actually sent extras and sent me the best 16. The price paid, both for the cells and the freight was higher than other suppliers.

The next order was for four cells matched at the factory. I paid US$118 each in July. They took several weeks to ship them which I was not surprised as I understood they were more or less made to order by Eve. The data shows all four are very close to each other. They came with a instruction sheet written by a DIY Solar Forum member.

This shipment was very well packed with plastic protectors taped to the boxes.

Capacity(Ah)OCV1(V)Ri1(mohm)OCV2(V)Ri2(mohm)OCV3(V)Ri3(mohm)
291.68493.3030.133.3010.143.2950.13
291.57203.3030.133.3010.133.2950.13
291.53283.3020.133.3010.143.2950.14
291.26493.3030.133.3010.143.2950.14

The next order was for 34 cells. It was placed only a month after the previous order. This time I paid US$123 per cell. The cells shipped straight away. They were shipped out of Hong Kong somewhere without any plastic protection on the corners but all seemed to have arrived in good shape.

Based on the data below, they don't look matched to me. When I asked about it I was told they stopped having the factory match them and now they are just "to their specifications" whatever that means. So the question is did I get what I paid for? It looks to me like I just got 34 random cells and I should ask for a discount. On the one hand their data says I received batteries with considerably more than 280 AH capacity. If they test good that is a reasonable result, but it is not what I was expecting and not what the pictures and description on their websites says they will deliver. The price for random cells should be about US$90-$100 per cell?

All the test data for the latest two sets of batteries was supplied on a website. What you see is what I received, but I have removed the column showing the serial numbers. There is no factory marks, test results or anything with the shipments to indicate the testing has been done so although I believe they are legit it is not as convincing as it could otherwise be.

Capacity(Ah)OCV1(V)Ri1(mohm)OCV2(V)Ri2(mohm)OCV3(V)Ri3(mohm)
293.74612.8020.132.7880.143.2960.13
293.64112.8000.132.7850.133.2970.14
293.42712.7980.142.7830.133.2970.14
293.18992.8000.132.7850.133.2970.14
293.13892.7940.132.7790.133.2970.14
293.01502.8030.132.7890.133.2970.14
292.96022.7990.142.7820.143.2960.14
292.94092.7940.132.7780.133.2970.14
292.85142.8030.132.7880.133.2970.14
292.67272.8040.132.7890.133.2970.14
292.58302.7990.132.7840.133.2970.14
292.42792.8040.132.7890.133.2970.14
292.37302.8000.132.7840.133.2970.14
292.36942.8030.132.7860.133.2970.13
292.26452.8030.132.7860.143.2970.14
292.17102.8030.142.7890.143.2970.13
292.10092.8010.132.7880.133.2970.13
292.07782.8030.132.7880.133.2960.14
292.07752.8010.142.7860.143.2970.14
291.82122.8020.132.7870.133.2970.14
291.82112.7990.132.7820.133.2970.14
291.73542.8000.142.7880.143.2970.14
291.72772.8000.132.7850.133.2970.14
291.72772.8010.132.7870.133.2970.14
291.53322.8020.142.7900.143.2970.13
291.22222.8030.142.7890.143.2970.13
291.06672.8040.132.7890.133.2970.14
291.06262.8030.132.7900.133.2970.13
290.96542.8040.132.7900.133.2970.14
290.72452.8030.132.7880.133.2970.14
290.62332.8000.132.7850.133.2970.14
290.57662.8010.142.7870.143.2970.13
289.96222.8030.132.7890.133.2970.14
289.95502.8070.132.7930.133.2970.14
 
Last edited:
I have now purchased 54 280 A Eve cells from Amy @ Shenzhen Luyuan in the last 12 months.

The first 16 were the received in October last year and were the original version with threaded terminals. I paid extra to have them tested before they left China and the data testing sheets showed 278-281Ah with the majority testing at 279Ah. Cost per cell was US$82. They shipped the cells before the test reports were made available to me, so I had no opportunity to accept or reject them. When the data was made available to me I questioned why the cells were under capacity but I was told they actually sent extras and sent me the best 16. The price paid, both for the cells and the freight was higher than other suppliers.

The next order was for four cells matched at the factory. I paid US$118 each in July. They took several weeks to ship them which I was not surprised as I understood they were more or less made to order by Eve. The data shows all four are very close to each other. They came with a data sheet written by a DIY Solar Forum member.

This shipment was very well packed with plastic protectors taped to the boxes.

Capacity(Ah)OCV1(V)Ri1(mohm)OCV2(V)Ri2(mohm)OCV3(V)Ri3(mohm)
291.68493.3030.133.3010.143.2950.13
291.57203.3030.133.3010.133.2950.13
291.53283.3020.133.3010.143.2950.14
291.26493.3030.133.3010.143.2950.14

The next order was for 34 cells. It was placed only a month after the previous order. This time I paid US$123 per cell. The cells shipped straight away. They were shipped out of Hong Kong somewhere without any plastic protection on the corners but all seemed to have arrived in good shape.

Based on the data below, they don't look matched to me. When I asked about it I was told they stopped having the factory match them and now they are just "to their specifications" whatever that means. So the question is did I get what I paid for? It looks to me like I just got 34 random cells and I should ask for a discount. On the one hand their data says I received batteries with considerably more than 280 AH capacity. If they test good that is a reasonable result, but it is not what I was expecting and not what the pictures and description on their websites says they will deliver. The price for random cells should be about US$90-$100 per cell?

All the test data for the latest two sets of batteries was supplied on a website. What you see is what I received, but I have removed the column showing the serial numbers. There is no factory marks, test results or anything with the shipments to indicate the testing has been done so although I believe they are legit it is not as convincing as it could otherwise be.

Capacity(Ah)OCV1(V)Ri1(mohm)OCV2(V)Ri2(mohm)OCV3(V)Ri3(mohm)
293.74612.8020.132.7880.143.2960.13
293.64112.8000.132.7850.133.2970.14
293.42712.7980.142.7830.133.2970.14
293.18992.8000.132.7850.133.2970.14
293.13892.7940.132.7790.133.2970.14
293.01502.8030.132.7890.133.2970.14
292.96022.7990.142.7820.143.2960.14
292.94092.7940.132.7780.133.2970.14
292.85142.8030.132.7880.133.2970.14
292.67272.8040.132.7890.133.2970.14
292.58302.7990.132.7840.133.2970.14
292.42792.8040.132.7890.133.2970.14
292.37302.8000.132.7840.133.2970.14
292.36942.8030.132.7860.133.2970.13
292.26452.8030.132.7860.143.2970.14
292.17102.8030.142.7890.143.2970.13
292.10092.8010.132.7880.133.2970.13
292.07782.8030.132.7880.133.2960.14
292.07752.8010.142.7860.143.2970.14
291.82122.8020.132.7870.133.2970.14
291.82112.7990.132.7820.133.2970.14
291.73542.8000.142.7880.143.2970.14
291.72772.8000.132.7850.133.2970.14
291.72772.8010.132.7870.133.2970.14
291.53322.8020.142.7900.143.2970.13
291.22222.8030.142.7890.143.2970.13
291.06672.8040.132.7890.133.2970.14
291.06262.8030.132.7900.133.2970.13
290.96542.8040.132.7900.133.2970.14
290.72452.8030.132.7880.133.2970.14
290.62332.8000.132.7850.133.2970.14
290.57662.8010.142.7870.143.2970.13
289.96222.8030.132.7890.133.2970.14
289.95502.8070.132.7930.133.2970.14
can you send a picture of the qr code if it is gold in colour and has the capacity in watt written in to it high chance hey are true grade A
silver coloured QR code not so grade A
 
This is the code on one of the latest cells. They are quite hard to read and my phone won't scan the QR codes.


20210828_200533_resized.jpg
 
the part LF280N 896Wh is important. very high chance these are grade A this cell needs to have 896 Wh capacity in the first 5 cycles after that 5% less this is normal for lifepo4
 
the part LF280N 896Wh is important. very high chance these are grade A this cell needs to have 896 Wh capacity in the first 5 cycles after that 5% less this is normal for lifepo4

It probably is grade A, but what is the point of buying matched cells when the vendor claims to buy 1000 at a time and the capacity spread in the group is 5.6AH? When I queried that further tonight I was told:

"Now, we require EVE to match batteries as 500pcs in a group." (Implying that there have been other complaints from the 1000 units)

"EVE matches every batch of batteries according to our requirements. At first, it matches every 16 batteries as a group. These 16 batteries may come from different production lines, or not on the same day, so their serial numbers may look different."

"Because some customers need more, such as 60pcs, 200pcs,so,500pcs as a group, this will ensure that all customers' batteries come from the same group."

"So, the capacity difference of the 500 batteries will also be within 5.6AH"

The spread on my 34 cells is 3.79AH, so what Amy is saying is that they no longer order batteries in matched sets from the factory for each customer. If my experience is anything to go by if you order more than 16, you are probably just paying a premium for nothing.

Another interesting issue is that the first four cells serial number begins with 02YCB66728200JACD... As I understand it EVE has not manufactured 66 specification cells for quite some time. So how did Luyuan get hold of LF280 and opposed to LF280N's in July direct from EVE as a new matched set? That appears to be a 2020 date code.
 
REALLY, Where & How did you divine that ? Specify where & how you came up with that.

It was not difficult Steve, and interesting that you should ask. Look at what was printed on the sheet I received. As you have been one of the ones heavily promoting this vendor here, I had very little reason to question it.

To be honest I have had a pretty typical buying experience from Luyuan up till now... 1st under capacity cells, 2nd old stock that came with your data sheet, 3rd not matched. The Chargery BMS was a total flop.

20210828_214713_resized.jpg
 
Last edited by a moderator:
I produced that Document but THAT is not th Test Reports or anything IS IT ?
I HELP people because it is the way I am and have always been. I have been doing Freeware/Shareware & Opensource since the mid 1980s !
I am also TERMINAL with Cancer (told in 2014 I had 5-7 yrs (I won't make it another two, likely not even 1 more) and I am doing my final bucket list things which includes helping OTHERS while not holding back information or playing the Secrecy (keep it proprietary games).

I HAVE NEVER Asked for or received ANY Compensation whatsoever from anyone for what I have done. I am NOT FERENGHI and NEVER EVER SHALL BE.

BTW Matched & Matched, Voltage & IR Matched, Bulk - Grey Market & B Grades have been explained repeatedly

PS: The document / Flyer & Downlodale from here...
No one had done such a doc for ANY supplier/vendor or anything. I did it generically so it could be used for ANY LFP.
To this day, I do not know of any Vendor/Supplier providing such information.
It was done to Support OUR Membership here... AND THIS SITE ! aka Will Prowse TOO for his efforts to help us all. Hence why is says Steve_S from DIYSolarForum.
 
Last edited by a moderator:
I have now purchased 54 280 A Eve cells from Amy @ Shenzhen Luyuan in the last 12 months.

The first 16 were the received in October last year and were the original version with threaded terminals. I paid extra to have them tested before they left China and the data testing sheets showed 278-281Ah with the majority testing at 279Ah. Cost per cell was US$82. They shipped the cells before the test reports were made available to me, so I had no opportunity to accept or reject them. When the data was made available to me I questioned why the cells were under capacity but I was told they actually sent extras and sent me the best 16. The price paid, both for the cells and the freight was higher than other suppliers.

The next order was for four cells matched at the factory. I paid US$118 each in July. They took several weeks to ship them which I was not surprised as I understood they were more or less made to order by Eve. The data shows all four are very close to each other. They came with a data sheet written by a DIY Solar Forum member.

This shipment was very well packed with plastic protectors taped to the boxes.

Capacity(Ah)OCV1(V)Ri1(mohm)OCV2(V)Ri2(mohm)OCV3(V)Ri3(mohm)
291.68493.3030.133.3010.143.2950.13
291.57203.3030.133.3010.133.2950.13
291.53283.3020.133.3010.143.2950.14
291.26493.3030.133.3010.143.2950.14

The next order was for 34 cells. It was placed only a month after the previous order. This time I paid US$123 per cell. The cells shipped straight away. They were shipped out of Hong Kong somewhere without any plastic protection on the corners but all seemed to have arrived in good shape.

Based on the data below, they don't look matched to me. When I asked about it I was told they stopped having the factory match them and now they are just "to their specifications" whatever that means. So the question is did I get what I paid for? It looks to me like I just got 34 random cells and I should ask for a discount. On the one hand their data says I received batteries with considerably more than 280 AH capacity. If they test good that is a reasonable result, but it is not what I was expecting and not what the pictures and description on their websites says they will deliver. The price for random cells should be about US$90-$100 per cell?

All the test data for the latest two sets of batteries was supplied on a website. What you see is what I received, but I have removed the column showing the serial numbers. There is no factory marks, test results or anything with the shipments to indicate the testing has been done so although I believe they are legit it is not as convincing as it could otherwise be.

Capacity(Ah)OCV1(V)Ri1(mohm)OCV2(V)Ri2(mohm)OCV3(V)Ri3(mohm)
293.74612.8020.132.7880.143.2960.13
293.64112.8000.132.7850.133.2970.14
293.42712.7980.142.7830.133.2970.14
293.18992.8000.132.7850.133.2970.14
293.13892.7940.132.7790.133.2970.14
293.01502.8030.132.7890.133.2970.14
292.96022.7990.142.7820.143.2960.14
292.94092.7940.132.7780.133.2970.14
292.85142.8030.132.7880.133.2970.14
292.67272.8040.132.7890.133.2970.14
292.58302.7990.132.7840.133.2970.14
292.42792.8040.132.7890.133.2970.14
292.37302.8000.132.7840.133.2970.14
292.36942.8030.132.7860.133.2970.13
292.26452.8030.132.7860.143.2970.14
292.17102.8030.142.7890.143.2970.13
292.10092.8010.132.7880.133.2970.13
292.07782.8030.132.7880.133.2960.14
292.07752.8010.142.7860.143.2970.14
291.82122.8020.132.7870.133.2970.14
291.82112.7990.132.7820.133.2970.14
291.73542.8000.142.7880.143.2970.14
291.72772.8000.132.7850.133.2970.14
291.72772.8010.132.7870.133.2970.14
291.53322.8020.142.7900.143.2970.13
291.22222.8030.142.7890.143.2970.13
291.06672.8040.132.7890.133.2970.14
291.06262.8030.132.7900.133.2970.13
290.96542.8040.132.7900.133.2970.14
290.72452.8030.132.7880.133.2970.14
290.62332.8000.132.7850.133.2970.14
290.57662.8010.142.7870.143.2970.13
289.96222.8030.132.7890.133.2970.14
289.95502.8070.132.7930.133.2970.14
For a little less emotional perspective, which I do feel Steve had a right to express, it is sometimes hard to temper disappointment. The topic of this thread is "Did I get what I paid for". Had you stuck to the facts instead of insinuating anything at all, you would have received a bunch of "Yes, you got what you paid for, enjoy building your battery."

I have discovered that very few people out there are as picky and "perfectionistic" as I am. It has taken years of practice to loosen up and just accept something less than perfection. 3 months ago I made a deposit on a custom aluminum box for my truck. Total bill will be ~$18,000. I told them all my specifications and gave them tolerances for the build. I very enthusiastically told them I am a C#$T to deal with and deviation from measurements beyond the tolerances would result in refusal of the build. Everything was up front. I went to pick it up yesterday and when I eyeball the bottom of one side across to the other side for parallel, in one 8' stretch they are out of parallel 1/4". My tolerance for parallel over the length of the camper (12') was 1/8" total deviation. The box was also ~1/4" short and another critical dimension was ~1/4" out as well. For these dimensions their own tolerance that they overwrote the 1/16" I gave them was 0.05". On top of that there were numerous details that were annoyingly out of square. Do I accept? It is going to drive me nuts at least in the short term. Several friends have said not to, a couple others dont get the big deal.

Long story short, your experience is on the good side of the norm. Dont loose any sleep and enjoy your build!
 
I have now purchased 54 280 A Eve cells from Amy @ Shenzhen Luyuan in the last 12 months.

The first 16 were the received in October last year and were the original version with threaded terminals. I paid extra to have them tested before they left China and the data testing sheets showed 278-281Ah with the majority testing at 279Ah. Cost per cell was US$82. They shipped the cells before the test reports were made available to me, so I had no opportunity to accept or reject them. When the data was made available to me I questioned why the cells were under capacity but I was told they actually sent extras and sent me the best 16. The price paid, both for the cells and the freight was higher than other suppliers.

The next order was for four cells matched at the factory. I paid US$118 each in July. They took several weeks to ship them which I was not surprised as I understood they were more or less made to order by Eve. The data shows all four are very close to each other. They came with a data sheet written by a DIY Solar Forum member.

This shipment was very well packed with plastic protectors taped to the boxes.

Capacity(Ah)OCV1(V)Ri1(mohm)OCV2(V)Ri2(mohm)OCV3(V)Ri3(mohm)
291.68493.3030.133.3010.143.2950.13
291.57203.3030.133.3010.133.2950.13
291.53283.3020.133.3010.143.2950.14
291.26493.3030.133.3010.143.2950.14

The next order was for 34 cells. It was placed only a month after the previous order. This time I paid US$123 per cell. The cells shipped straight away. They were shipped out of Hong Kong somewhere without any plastic protection on the corners but all seemed to have arrived in good shape.

Based on the data below, they don't look matched to me. When I asked about it I was told they stopped having the factory match them and now they are just "to their specifications" whatever that means. So the question is did I get what I paid for? It looks to me like I just got 34 random cells and I should ask for a discount. On the one hand their data says I received batteries with considerably more than 280 AH capacity. If they test good that is a reasonable result, but it is not what I was expecting and not what the pictures and description on their websites says they will deliver. The price for random cells should be about US$90-$100 per cell?

All the test data for the latest two sets of batteries was supplied on a website. What you see is what I received, but I have removed the column showing the serial numbers. There is no factory marks, test results or anything with the shipments to indicate the testing has been done so although I believe they are legit it is not as convincing as it could otherwise be.

Capacity(Ah)OCV1(V)Ri1(mohm)OCV2(V)Ri2(mohm)OCV3(V)Ri3(mohm)
293.74612.8020.132.7880.143.2960.13
293.64112.8000.132.7850.133.2970.14
293.42712.7980.142.7830.133.2970.14
293.18992.8000.132.7850.133.2970.14
293.13892.7940.132.7790.133.2970.14
293.01502.8030.132.7890.133.2970.14
292.96022.7990.142.7820.143.2960.14
292.94092.7940.132.7780.133.2970.14
292.85142.8030.132.7880.133.2970.14
292.67272.8040.132.7890.133.2970.14
292.58302.7990.132.7840.133.2970.14
292.42792.8040.132.7890.133.2970.14
292.37302.8000.132.7840.133.2970.14
292.36942.8030.132.7860.133.2970.13
292.26452.8030.132.7860.143.2970.14
292.17102.8030.142.7890.143.2970.13
292.10092.8010.132.7880.133.2970.13
292.07782.8030.132.7880.133.2960.14
292.07752.8010.142.7860.143.2970.14
291.82122.8020.132.7870.133.2970.14
291.82112.7990.132.7820.133.2970.14
291.73542.8000.142.7880.143.2970.14
291.72772.8000.132.7850.133.2970.14
291.72772.8010.132.7870.133.2970.14
291.53322.8020.142.7900.143.2970.13
291.22222.8030.142.7890.143.2970.13
291.06672.8040.132.7890.133.2970.14
291.06262.8030.132.7900.133.2970.13
290.96542.8040.132.7900.133.2970.14
290.72452.8030.132.7880.133.2970.14
290.62332.8000.132.7850.133.2970.14
290.57662.8010.142.7870.143.2970.13
289.96222.8030.132.7890.133.2970.14
289.95502.8070.132.7930.133.2970.14
I think the biggest problem you experienced is probably the language/culture disconnect. The stuff you told us they communicated (not matched or binned) probably didnt come through to you properly in translation.

I am curious about the "new old stock" you mention. How did you come to the conclusion of the production year and that you had gotten old stock?

The data you showed seems good. It does suck that your experience got totally hosed. I could imagine in their haste and confusion to get everything managed and shipped, they lost sight of the purpose of (for example) providing the test data, etc.

That said, you could always use the data to file a complaint if anything isn't as it says it should be.

I totally get where you're coming from, even if it seems the cartel of the diysolarforum wants to jump down your throat. ?

Can you elaborate on the date code stuff?
 
Last edited:
if i start ordering premium 280ah eve cells from Amy i expect them to be 105 % of the rated capacity and all within 2 amp deviation.
sorry i`m Dutch
for the alu box guy trow it in a freezer it will shrink ( sorry :cool: )
 
Let's just stick to the facts here. My original order was for 16 "grade a" cells. The supplier sold them to me knowing most of did not quite meet their rated capacity. The capacity spread was 3 Ah, and they were not matched.

The second set of four appear to be grade a but are LF280 as opposed to LF280N. Their capacity is 291 AH with a spread of 0.42 AH. The 291 AH is not a surprise, because that is what I was told they would test at. I think it is fair to expect a quality new cell to exceed specification. Many EVE cells did, the 272 AH Lishen did. Even some of the cheap Amazon battery packs Will is now reviewing exceed rated capacity. By serial number they were manufactured on the same day and they were sold to me as "factory matched".

On the strength of this I purchased 34 more one month later. They are LF280N and were sold to me as "matched". The capacity spread on these is 3.79AH. If I make two 16 cell packs and have two spares as intended the packs will have a spread of 1.75 - 2AH and there will be 2AH between the lowest capacity cells in each pack. By serial number they were manufactured over a three day period.

Luyuan have told me they changed the way they do this. They now buy a batch of 1000 or 500 and they match them. If you buy a few cells they should be close, if it is a "big order" then they say the will not be able to do as well. In either case the variation could be as much as 5.6AH across a batch of 500 cells.

In my experience (3 transactions and 54 cells) you won't find out what you are actually getting until after the goods ship.

I simply post about my experience for others who may be considering purchase. I'm sure that's of interest to some....
 
Let's just stick to the facts here. My original order was for 16 "grade a" cells. The supplier sold them to me knowing most of did not quite meet their rated capacity. The capacity spread was 3 Ah, and they were not matched.

The second set of four appear to be grade a but are LF280 as opposed to LF280N. Their capacity is 291 AH with a spread of 0.42 AH. The 291 AH is not a surprise, because that is what I was told they would test at. I think it is fair to expect a quality new cell to exceed specification. Many EVE cells did, the 272 AH Lishen did. Even some of the cheap Amazon battery packs Will is now reviewing exceed rated capacity. By serial number they were manufactured on the same day and they were sold to me as "factory matched".

On the strength of this I purchased 34 more one month later. They are LF280N and were sold to me as "matched". The capacity spread on these is 3.79AH. If I make two 16 cell packs and have two spares as intended the packs will have a spread of 1.75 - 2AH and there will be 2AH between the lowest capacity cells in each pack. By serial number they were manufactured over a three day period.

Luyuan have told me they changed the way they do this. They now buy a batch of 1000 or 500 and they match them. If you buy a few cells they should be close, if it is a "big order" then they say the will not be able to do as well. In either case the variation could be as much as 5.6AH across a batch of 500 cells.

In my experience (3 transactions and 54 cells) you won't find out what you are actually getting until after the goods ship.

I simply post about my experience for others who may be considering purchase. I'm sure that's of interest to some....
I hope you don't mind me stepping in here as I was ready to discuss my own experience, and it was with Basen, not Luyuan, but there are similarities. Several people say there was a reason to go with Luyuan as you were getting "matched" cells. If you bought batteries elsewhere, you weren't getting that special treatment. I chose to go with Basen to buy domestic quicker vs. later.

I received LF280 and am still trying to find out when they were made. The spreadsheet shows a sample cell is 291.1a. Because I haven't opened the other boxes, I only have two serial numbers, so she provided the whole spreadsheet for their 2,000 cell order from EVE. It appears BASEN shipped 200 of the 2,000 to the US warehouse as my boxes were various xx/100 on them. The point is, it seems my cells were as much matched as your cells, and in my mind, that isn't matched. That is like saying "we know what they are therefore they are matched". Even if they had gone through the 2000 and put them in sequence based on the spreadsheet, they would be somewhat matched, at least for amperage.

IF I understand right, you didn't even get all of the same model, and a concern that LF280 are not current production. That is the aspect of this I am working on now, asking EVE the LF280 production status.

Thanks for sharing your experience, as I am mine, so we can make better educated choices about where we spend our money and what we are gong to get.
 
Another interesting issue is that the first four cells serial number begins with 02YCB66728200JACD... As I understand it EVE has not manufactured 66 specification cells for quite some time. So how did Luyuan get hold of LF280 and opposed to LF280N's in July direct from EVE as a new matched set? That appears to be a 2020 date code.
The only cell number I have handy is a LF280 02YCB66718300JACD

You have something that interprets that to be a 2020 cell? You are the only other one I have heard of that got some of these cells, but you from Luyuan, and mine from Basen. I would really like to know the heritage of these cells as I am in the keep or return mode.
 
Several people say there was a reason to go with Luyuan as you were getting "matched" cells. If you bought batteries elsewhere, you weren't getting that special treatment. I chose to go with Basen to buy domestic quicker vs. later.

From what I can see there are a number of vendors selling genuine grade a cells. Luyuan may have been the first and a number of people on here my sing their praises but I am not so sure they are doing anything overly different. "Fully matched" seems to mean we tell you the capacity.

IF I understand right, you didn't even get all of the same model, and a concern that LF280 are not current production. That is the aspect of this I am working on now, asking EVE the LF280 production status.

I did not get mixed cells but the first was 4X LF280 and the next order was 34 LF280N.

The only cell number I have handy is a LF280 02YCB66718300JACD

You have something that interprets that to be a 2020 cell? You are the only other one I have heard of that got some of these cells, but you from Luyuan, and mine from Basen. I would really like to know the heritage of these cells as I am in the keep or return mode.

As far as I can work out the LF280 (type 66) cell dates back to about 2018. There are multiple specification sheets for them that show the serial number decode, with/without compression etc. The QR code on mine also shows LF280.

The LF280N (type 71) is a newer cell which most people seem to have received in the past 12 months. 3500 cycles 1C rating.

There is another new cell LF280K (type 76), which is a 280AH 2C cell and 6000 cycles life (see https://evlithium.com/hot-lithium-battery/eve-lf280k-280ah-lifepo4-battery.html). This is what Luyuan seems to be selling on their store now for $125.

That URL has a decode for the new cell which refers to A99 as being 2020. Cross comparing other member's serial numbers and a number of the data sheets I concluded that the first digit in the date code is incremented each year. My LF280N cells have date code B3D , C and E. I know these are 2021 cells. My LF280 Cells are ACD, so logically they were manufactured at the end of December 2020.

Maybe EVE still manufactures the LF280 for large customers. This could be a good thing if you need a spare cell for an older pack. I didn't really go into it but I had a cell fail in my original set and there was not a lot of warranty support offered. I'd recommend everyone buy a spare cell or two as you might really struggle to get a compatible replacement cell later.
 
From what I can see there are a number of vendors selling genuine grade a cells. Luyuan may have been the first and a number of people on here my sing their praises but I am not so sure they are doing anything overly different. "Fully matched" seems to mean we tell you the capacity.
Who are the others?

I see a lot of them making that claim ..... but am not aware of any that can demonstrate it's true.

I am in the category as several others .... I don't really understand what your beef is. Seems like you ordered a lot of cells and always got good ones.
If you were unhappy, why did you keep coming back to Amy to buy cells?
 
Maybe he/she wanted them to be exactly 280AH capacity and not higher and of course 1 mohm difference is a shocking uge issue.
A lack of understanding +++ = foofarah
nothing to see
 
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