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I accidentally found Andy's video about eight hours after he released it. Interesting. I wouldn't have expected so many things to be "wrong" with such a pretty BMS. I can only hope the manufacturer watches his video and takes everything to heart to correct the flaws in their product. I find...

So who are the people to talk to at the moment for prismatic LiFePO4 cells? I keep reading of the various Amys or Jennys with no references to an actual website of any kind. Chinese company names are mentioned in various threads but it seems like people can't keep them straight. Even in the...

I'm pretty sure the BMS in the link above is a JBD model, based on the app provided. I've used the same app with my 150A JBD BMS units. The JBD-AP21S002 silk-screened on the PCB also gives it away. I would hazard a guess that it is contactor based just on the size of the unit. And the large...

While attempting to dig up info on a JK B2A8S20P BMS I stumbled on to a line of BMSes that I've never seen discussed on these forums: The "100 BALANCE BMS" series that's made by Dongguan Balanced Management Technology Co. Ltd. While it seems that they don't go beyond 100A units, they give the...

Its been a year, and I haven't had any luck in finding any JBD BMS firmware updates. I think that by the time they release a product, their engineering team has already moved on to other things. Why fix an existing product when you can just sell the public a new one... packrat

Hi, Sorry, I have no experience with JK BMS units, but is there any chance it could be some kind of current-sensing coil? Post more pictures, especially of any connectors that might attach to the BMS or display.

Is anybody aware of a repository with the files necessary for upgrading the firmware of JBD BMS units? I have (2) JBD-SP04S028A-L4S-150A BMSs, both made on November 6, 2021, and list the installed firmware as Beta 2.0. I do have issues with the balancing function not always following the set...

Yeah, I think mine are in the 280Ah range too, even though they were sold as 302Ah units. I contacted Basen, and they did take a bit off the original price via a refund. This is what they tested out as:

Ok. I’ll give it a shot once I can track down some appropriate wire.

Hello, I have a JBD-SP04S028A Smart BMS with (2) offboard temperature sensors. For whatever reason, the manufacturer decided to make the leads for the two sensors about 9" or so long. This makes it very difficult to place the sensors anywhere useful. Can I just extend the sensor wire (cut...

Okay. Still working on the capacity testing thing. Got to get the battery built first. Just crimped lugs on most of my BMS wires yesterday, and ran out of time. Life keeps intruding on this battery building business….

Thanks for the reply! I wasn’t sure if anybody was going to. So does this mean that the cells are used? And other than performing a manual capacity test (which I plan on doing right), is there a way to determine their original capacity?

Thanks for the reply! I wasn’t sure if anybody was going to. So does this mean that the cells are used? And other than performing a manual capacity test (which I plan on doing), is there a way to determine their original manufacturer, date of manufacture, capacity, etc

Ok, A bit more info. I took some measurements and weighed each cell and came up with some numbers. For those of you familiar with these details of your own cells, what capacities seem to match? All dimensions are in mm, weight in Kg. Brand X 191? CATL 302Ah...

Today I finally received the (4) cells I ordered from Shenzhen Basen Technology back in November. Some 97 days ago. They all appear to be in great shape physically. No dents, scratches, or bloating, but I have some doubts to the actual manufacturer and the capacity. I was promised Grade A...

Yeah, I think I should be able to keep the system under 200A of total operational draw. The BMS will make sure of that. So, in total, you're saying that as long as I keep the battery fusing below the ~12V wire rating (with some padding) AND select a fuse that has an appropriate AIC for...

I understand that the fuse is there to protect the wiring. When I built my system 3 years ago, I used some surplus 00 AWG (I think that translates now to 2/0). At the time, I had (2) 6V T105 cells in series and was using a 150A circuit breaker as the interrupt. Well, thinking back on it, that...

Hello I‘m planning on building a single 4S battery pack with (4) CATL 302Ah cells soon, and have been here gathering info here on all the things needed. One very important component for this battery, which will be installed in my travel trailer, is the battery’s master current disconnect...