JK BMS 4-8S

[hardtop]

I'd try the above with pin 9 and 10 to cell 4 positive. (pins 5 thru 8 unused)

Failing that, pins 5 thru 10 to cell 4 positive.

I dunno.

Thanks for the responses. Tried that and it doesn't power on, it is DOA.

 

[hardtop]

The last thing I could do with the JK BMS was to take it apart before throwing it away. I'm keeping the wires and sensors since those can be reused.

 

[740GLE]

Did you connect the power switch?

Step 4 states use the activation or display switch to turn on.

 

[hardtop]

I did connect the power switch and toggled the switch with all the cables connected. The circular light around the switch didn't illuminate and there wasn't a bootup noise. I tried jumping the pins for the power switch in case the switch was bad, no dice. It was an open box.

 

[740GLE]

Bummer I have the same BMS I ordered through hankzor Ali site ($78 shipped) that I need to get up and running.

Converting 230ah Eve 2P4S jbd to 8s jk.

Did you ever contact 18650 about the issues your having?

 

[hardtop]

I did contact them and I fought to get my money back and they gave me 50% of it. I paid about $135 for it.

 

[740GLE]

Ouch

Just found this amazing item on AliExpress. Check it out! $62.88 39％ Off | JK SMART BMS 4S 5S 6S 7S 8S 12V 24V BATTERY WITH 1A ACTIVE BALANCE HEAT FUNCTION ON SALE

https://a.aliexpress.com/_mOkLWy0

Just saying

 

[hardtop]

I didn't want another JK so I bought a Smart Jiabaida (JBD) 4S 12V 200A. I hope to get it soon.

 

[740GLE]

I did add an active balancer to my JBD

 

[hardtop]

I did add an active balancer to my JBD

Which one did you get?

 

[740GLE]

the hankzor 4s, I wired in a switch and only turned it on as needed but I left it plugging in all the time.

The other adjustment I made for the BMs was balance all the time while cells >3.4v not just while charging. My bank has zero load majority of the time and only used on weekends so each day it got 4+hrs of balancing and kept cells nice and happy. So much so I haven’t used the active balancer for quite some time.

 

[hardtop]

the hankzor 4s, I wired in a switch and only turned it on as needed but I left it plugging in all the time.

The other adjustment I made for the BMs was balance all the time while cells >3.4v not just while charging. My bank has zero load majority of the time and only used on weekends so each day it got 4+hrs of balancing and kept cells nice and happy. So much so I haven’t used the active balancer for quite some time.

The hankzor is priced right and it looks good. I bought the JBD 4S 200A, it finally arrived and in the box it has a pamphlet that says I should buy an active balancer. I thought I was getting that lol.

 

[740GLE]

IMO it all depends on how often your cells see >3.4v mine once charged we’re able to passive balance for 2-3 hours a day and had little to no load on them between next charging.