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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...

@Zwy and Others, Regarding the JK BMS units with the active balance function, are Bluetooth and RS-485 on ALL of the boards? When the CAN communication option is chosen during the ordering process, does it replace the RS-485 or is it just an additional communications option? Even the language...

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:

Well they're back now. But $85. I don't need one that bad.

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...

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

I have a work vehicle that will run its accessories until a battery-saver circuit decides the starting battery must be preserved, and shuts everything off. I just wanted to parallel separate battery to hold the voltage up for a longer accessory runtime. I'd like to have the LiFePO4 battery...

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...

Thanks for taking the time to reply. The Sterling unit appears to handle the charging portion, however it is way to expensive and didn't seem to handle the parallelling. The other unit PARALLELS both batteries while charging only.did I miss something?

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

@haraldh Thanks for posting your experience with the newer version of mr-manuel's serial driver. I'm using that to connect to a Victron CerboGX. Most of it works, though I'm currently having some issues with how the current version of the serial driver hands out JK-B2A8S20P's temperature...

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...

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...

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...

Hello, I would be interested in observing the progress of your house battery build. You said 4S4P, so that means (4) 314Ah 12V batteries parallel, right? Each with its own 100A BMS? What is your expected maximum current draw? (4) 100A BMS units in parallel will give you a lot of amps, but...

Can anybody recommend in an inexpensive automotive-style charger that can isolate and replenish a LiFePO4 battery from a car's alternator (at the proper voltage levels) while the car is running, and then, when the engine is shut off, connect the LiFePO4 battery in parallel with the starting...

C, Would you be able to share just where you found the v4.28.0 version of the JK BMS app? Is this on Android or iPhone? As far as I can tell, the latest iPhone version is v4.27.0. Thanks in advance... packrat

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...

Thank you Everyone for your replies and expansions on my original post. I always appreciate the new things I learn when I come here. There seems to be some major concern with stress on the spot-welded aluminum battery terminal with regards to mounting an MRBF fuse holder directly to it...

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...

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...

Does it generally hold true that if a BMS has separate ports for RS-485, CAN, and BT, then they operate independently? My (2) JBD-SP04S028A-L4S-150A BMS units work fine on either RS-485 or BT, but both connections are made using the same port. I currently have a multi-pole switch connected to...

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

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.

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….

Does anyone know of a specific 12V to 24V BMS that can connect with a Bluetooth app while simultaneously delivering data via RS-485? So far, my only experiences have been with JBD BMS units that allow for only one data connection (Bluetooth OR RS-485) at a time. I have been using a...

Hello, Is there someone out there that can help me clarify a couple of issues regarding the JK-B2A8S20 series of BMS'? It seems that not a single vendor on Alibaba or AliExpress can reliably list the specific model number with it's included feature set for this line of BMS'. The manufacturer...

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...

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?

Hello, I'm in the process of building my second 12V LiFePo4 battery. This time around I'm using Eve 304Ah cells with the double-bolt-style terminal (correct me if there is a proper name for it). These terminals use (2) 6mm bolts instead of having a single stud like my last battery build...

Thank you for all the replies. They have been helpful, but more info/recommendations are welcome. I guess overall, the largest issue here is the lack of English documentation for this specific series of JK BMS'. Block diagrams that show just what hardware is needed to get the necessary data...

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...