I really have searched here and pretty much everywhere... the more I search, the more confused I get.
I asked for a 100A BMS with active balancer for 8s (24V).
The vendor suggests a JK-BD6A20S10P. $65, which sounds good. Except, it has pins for 20 cells, not 8.

Trying to find out the proper way to connect just 8 cells, I really get confusing and conflicting information.

Some people say, just connect the first 8 pins. Some say, yes, but connect the last pin (B8), to B1 as well. Like so:

But then some say, pretty much, No! Don't do that! If you do that the BMS will shut off, you'll cause a chain reaction which will EMP everything for a 69 miles radius, your neighbours will be mighty pissed off, the Central Scrutinizer will... er...

Now, the manual I found for that BMS, does suggest that type of connection, but says: "If use the BMS for lower voltage than 36V, pls use the booster together."
And "12v battery, use 12v to 48v booster, 24v battery use 24v to 48v booster."

I asked about the booster, drew a blank. So, do I need the "booster"? Can I make it myself? If it's just a low-current 24-to-48 converter, it's easy enough.

Does anyone know?

Edited April 28, 20224 yr by Don B. Cilly

as seen in this video the b+ has to be connected to the last battery positive ie the number 8 wire and the b+ has to be connected to the 8th cell positive

where did you buy the item , want to get one of these

 

from what i have read while googling for a bms on certain configuartions you need external powersupply to supply power to the bms if voltage from battery config is lower than what it needs as it draws power from your battery, can't find the site i read it so not sure what the voltage is where the external power is needed

 

 

Right, thanks.

I have been assured by BMS experts that newer models don't need any booster, you just connect them as shown.

I bought mine from Shenzhen Luyuan, together with the cells, I should get them in a week or so.

BMS, $65, display, $13.

 

 

Edited July 9, 20224 yr by Don B. Cilly

I can confirm that the BMS works fine without any booster.