Extreme Team bad cell trouble

[augiedoggy]

Originally Posted by Pat911

The JBD BMS’s are good, but in this application, with a mix of old and new cells I would recommend the JK with active balancing over the JBD. The JK is also configurable from 7 or 8 (depending on chemistry) to 24 strings so he can try the remaining 20 cells before purchasing another 4. Most JBD BMS’s are fixed strings.

The jbd I have is configurable from 5-21 cells but they have a 7-24 version too. I would agree with you that the 2a balancing is important. I added a 5a balancer to my pack on a voltage switch to enable over 3.4v but that's more work for little gain vs the jk.

[Pat911]

Yes, there are multi string JBD’s, but most are fixed string.

[Upnoverm]

Originally Posted by augiedoggy

The 173ah cells you linked above are different from each other and at least one of them are catl cells

OP you can always test the capacity of the cells to see if they are still performing... 173ah cells arent cheap. I have both the 250amp ant bms as well as a couple jk bms now and the jk is hands down better. You want to be sure to get the higher amp model with the 2amp active balancing. they also make a fairly inexpensive little amp/battery gauge that plugs into the jk bms.

The JBD bms are good too I use a 300a/600a peak JBD relay style bms in my cart

Augiedoggy, can you please define what is different about the cells? The only one that does not descriptively state that it is a CATL is the Aliexpress link. So far, I have seen only one “version” of the CATL 3.2V 173ah cells.
If I do purchase replacement cells, I was going to give this site a go:
https://batteryfinds.com/product/cat...battery-cells/

Also, how can I test the capacity of my cells?

I just ordered the JK BMS from the link Pat911 provided. I would rather spend a few more bucks and order directly from the manufacturer than a third party vendor. I’ve read that the JK and JBD BMS’s are both very good, but it’s nice to see multiple people vouching for them on my post. Sounds like the JK will be the most reliable, provide plenty of power, and has a great active balancer built in, so I think I will be quite happy with it.
The JK BMS on App Store is all in Chinese, will I be able to select English when I download it, or should I use something else?

I assume installation will be pretty straight forward?
Main B+ and main B-
Cell monitor/balance leads
Thermistors
What about ET “on/off” switch?
My ET/ANT battery gauge will not work with the JK BMS?

[Pat911]

Cell capacity can be checked with a capacity tester, testing each individual cell or the pack as a whole. Testing individually will take a very long time. You can also set up the new BMS, charge fully and then draw down the pack and use the BMS to check capacity. We can get into this when you’re set up for it.

You will get better support should you need it from the factory store than a third party vendor.

There is an English app in the App Store. Images show Chinese but it is in fact English.

Connection is simple, as you described.

JK BMS comes with its own illuminated power switch. I haven’t seen the ET switch so I don’t know if it can be adapted.

Is the ET gauge a stand alone shunt meter or is it connected to the BMS? If it’s stand alone then it can be used. JK has an add on meter that connects to the BMS, or you can get the Renogy 500A stand alone meter.