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We (gobelpower.com) have tested the capacity of 5757 pieces EVE LF280K cells with B Mark (directly from EVE), here is the capacity distribution diagram, hope it can help.

Here is an EVE patent: "Screening method for consistency of lithium-ion batteries". https://patents.google.com/patent/CN111438083A/en (1) pre-screening: carrying out a self-discharge test on n batteries with SOC larger than or equal to 30%, and selecting the battery with the battery voltage...

You can check code here: https://www.gobelpower.com/lifepo4_decoder.html

You can find it in Gobel Power.

Yes, to make fake test report is easier than QR. I think only two kinds of cells: QC passed and QC failed. Manufacturers only sign a contract with customers for QC passed cells. QC failed cells are sent to several large wholesale distributors.

You can use online battery cell qr code decoder here: https://www.gobelpower.com/lifepo4_decoder.html This is the result for the second qr. Code from first picture is not a standard code for battery cells.

These guys spent a lot of energy on developing new methods to make fake QR. Still not perfect though.

American Indians cried.

I cannot guarantee that every cell from Gobel Power is perfect. But I can guarantee that if you buy Grade A cells, you get Grade A cells. If you buy Grade B cells, you get Grade B cells (no fake QR).

According to CATL 280Ah datasheet: 1. The cell is discharged in the standard discharge method (0.25C), Continuous discharge temperature rise is ≤10°C. 2. The cell is discharged at 500A for 10 s under any state of charge, Pulse discharge temperature rise is ≤5°C. The charging process generates...

It can be erased by laser, then laser new code. Someone did this:

Yes, I have experienced the same issue. One cell shoots up to high voltage while charging, and low voltage while discharging. After inspection, I found that it has a poor connection with the busbar. Then I used some conductor paste on every busbar, the bad cell works as a Grade 5A cell right now.?

Here it is For your first question, I have no confirmative answer yet. I think Cells with B mark are same as previous cells with intact QR sold by third-party suppliers. I do not want to use Grade A/B system, because now it is full of confusion considering some suppliers claim they have A+...

CATL CPT3.0 battery pack has upside-down cells. https://www.tycorun.com/blogs/news/tesla-4680-battery-vs-catl-ctp-battery SAIC (giant car manufacturer in China) new battery pack has lying cells...

Here it is.

My greed philosophy is to buy grade A cells with grade B prices.

date of manufacturing is at the beginning of this year.

Here is the answer.

Daly parallel module is to limit current between packs, no balance. It has a communication port which has to be connected with Daly BMS parallel port. So special BMS with parallel port needed. Every pack parallel connected has to have parallel module.

Technology is updating fast, these are all fake QR. Good luck.

Background.

These are recycled used cells, standard codes has been wiped. Codes in your pictures are not standard codes. All new cells has 24 bit standard codes following standards issued by China goverment. Standard code can be decoded here: https://www.gobelpower.com/lifepo4_decoder.html

Excel is well made, but re-lasered cells. That is irony.

B mark only destroyed Barcode, but most letters are still available. Especially production date code is intact. Here to decode B mark cells' production date. https://www.gobelpower.com/eve-b-mark-lifepo4_qr_decoder_ap15.html

These are cells produced in different years. Here are decoded information for 08BCBPB21AA011AAK1101784, 08BCBPB119B1319BWA210029 from https://www.gobelpower.com/lifepo4_decoder.html

Column J

Here is decoded information for 02ycb66728200jacc0012960 from https://www.gobelpower.com/lifepo4_decoder.html Production date code is always in the code, this coding format is following standards issued by China government. Every company has to follow.

These are Lishen 272 cells, here is decoded information from https://www.gobelpower.com/lifepo4_decoder.html