Most reacted posts

I have been testing the BMS today and noticed there was an instant change in the readings when the cell 9 negative connection is made and removed , I'm not convinced that it's fully fixed but it's a definite step in the right direction , I'll give it a few days but I think the JBD will be...

Yes I did when we thought it was the cell and they felt it was impossible to change the cell due to the laser welding so gave me a partial refund and then blocked me from all communication !:mad:

Cool Lithium , not sure if I'm allowed to put a link ?

Yes that is my point there is no need for the 18th feed so why is the facility there on both but is only utilised on the JBD - it's the only cell on the PCB that is asked for a negative and positive feed ?

Here it is - https://www.coolithium.com/product/lifepo4-battery-300ah/ I can't find anything along the lines of software app Help/About or FAQ , according to the website it's been developed in house.

I like your way of thinking , you are right about the two banks but I've not noticed any variation, all other cells are very stable and well balanced including cell 8.

Hello this is my first time posting , I wondered if anyone has experienced similar ? Cell 9 of 16 x 300ah is reading up to 300mv higher on charge at 50a and 200mv lower on similar discharge than all the others which are closely balanced this indicated to me that I had a high resistance cell ,I...

Update - I've bought a replacement BMS - JBD UP16s010 200A as I was looking into the best way to tackle the change then noticed that there's no connection from cell 9 negative to the pcb so I'm tempted to try it but thought it best to see if anyone could explain why the original has facility...

Thank you for your replies , I'm up against it when it comes to swapping cells as they have all been laser welded together and was tricky enough to just change the one cell , I'm getting accurate voltages (inc.8 and 10) back at the pcb that are reflected in correct BMS readouts all bar cell 9.

Correct

I again agree with your way of thinking and Yes I have done a couple of SMD repairs but that was 12 years ago and I was on my limit of capabilities then - that was BMS faults on a couple of ev's !, I might consider it if I can find the fault and identify the component but I found that work very...