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QRs are on the same place where they should be and read well by qr scranner. Codes are different from cell to cell. I have checked under cover and have not found scratched codes in other places.

grade A, grade B... in this case it is not easy to distinguish(but should we ever bother about this?). Eve has B marks on qr of some grade B cells for some time . Mine have no marks, just original qr codes. The only cryteria, maybe, is be presece of EVE test sheets.

standard discharge (at which battery should be tested) is usually 0.5C, so 140 Amps. I don't have such loads or tester :)

Jsut received July 2023 cells from Docan. Measures 308 Ah at 20A discharge. With octahon terminals.

Mine B2A8S20P has unmarked 10 pin chip in package smaller than SOP near this place. I have already 3 bms with such malfunction. :( They are more or less working, except something happens with current reading and hence with SOC as well. Also, one bms which is on a tricycle (small ev) deny to...

Is there any way to clear it manually?

Thank you for the information! My sti is still on the way. Have you changed only one or all three chips?

Schematics on the 4s-8s bms looks like typical for RY3820E. Particularly there is Cff capacitor parallel ro R1 (top resistance in divider) as well as two output capacitors in parallel.

https://www.renrendoc.com/paper/91726470.html This seems to be the complete datashet for RY3820

There are some android apps that allow generating sound at different frequencies.I have tried. Young people are much much more sensitive to high frequencies. They hear hf sound from large distance even when I don't hear feel anything ;).

Touchng mosfet gates with oscilloscope reduces the noise, but still shows 0.1-0.2 ms wide voltage drops with sharp decreasing and relatively slow restore.

It is just not possible to send a cell back to China, too much troubles and cost :) Manager decided to ship spare cell on next order. Just now it is assembled (we have noticed a problem after battery assembly and startup) and working in my fiend setup as the only battery, so I can't easily pull...

Also, touching the 6 pin converters near capacitors reboots the BMS

I have opened B2A8S20P bms connected to 4s battery right now. Same issue with the noise. I noticed that current on CC-CV charger reduces to about half when this sparklink noise appeared. I don't know if it cen help, but placing a fingers on MOSFET terminals near P- eliminates the noise and...

I have encoutered the same issue. Charging with simple CCCV charger gives arching noise. While connecting crocodiles it is even possible to see regular sparks between contacts and feel the noise by hand :(. I have figured out that placing a finger over the first row of mosfets or pressing them...

I have the same issue. I recommended such bmses to neigborhoods. Two of them faied already. One with this communication problem and another one with some strange noise and reduced charge current (seller didn't respond yet to the messages about it, seems like the MOSFETs are switching on and off...

By the way, manager said that they sent wrong cell. Mine was manufactured in Nov 2021 by QR code

Haha, I have just received another Docan CATL 280 batch from Chinese warehouse. And noticed one cell with original QR code instead of small ones. And it is ..... it is .... CATL 302 :)

I gained a lot of experience with balancing lifepo batteries last weeks helping neighbours. I would suggest that top bapance is necessary for all batteries regardless of grade :). It can be much difference in SOC doesnt matter there is absolutely no difference in voltage after shipment. Cells...

I had set the battery to the system in order to charge it first in the system, not in parallel (way too long). Then I had seen a very small difference in cells voltage and decided to keep it for some time. At this point I had a confusion. Now I realize that I should measure difference not in the...

I see. This could be the reason. I have topped-up this cell individually for a short period of time and it didn't fall to so low voltage again (but with balance turned off). I'll check today more thoroughly.

I have a solid understanding of how balancing works in general and in such bms in particular. BMS clearly states what cell is discharged (with highest voltage) and what cell is charged (lowest one). But this lowest cells is going lower and lower during such "balancing" (in time range of tens of...

I use JK-B2A8S20P with 8s eve lf280k (from Docan) battery bank installed couple of month ago. I see a strange behavior during balancing at the high SOC (balance is on after 3.40). Charging current is 1-2A or lower(battery is charged). All others cells are around 3.5 V but one was 3.38 and...

MOQ is 200 pcs :(

Hi. I am also looking for non-polarized breaker. Just found Projoy PEBS series. They specially emphasize that it is non-polarized in video on website, also this is stated in datasheet in cnnection diagram. datasheet for 125A low voltage version...