I shouldn't have started with the Daly BMS. It is just an annoying piece of...
Well, I thought it would work well with the 4s sodium battery we are building in this video. A simple, small passive balancer should be enough for these tiny 1.3Ah 18650 cells. But no, not with a Daly... It has charge balance AND a huge current measure threshold of 1.1A. This in combination makes this BMS unusable for your experiment. I walk you through the pain😬
I then tested the Jiabaida BMS, the good old Ciabatta! At least here we have the choice to use charge balancing or not. We can test out the balancing of this 4s sodium battery at different voltages, which works great. But even here, the 30mA passive balancer will take a long time to balance out this small battery.
So, next on the list was the JK-BMS. The smallest JK-BMS you can buy... a JK-BD4A8P4P. Perfect for such small batteries. It has a 0.4A active balancer which I turned down to 0.3A (the lowest setting in the BMS). Within 15 min, it fully balanced this battery without hesitation! Of course... it's a JK!
It seems like, we can balance these sodium batteries at any voltage thanks to its linear curves. So we just leave the balancer running all the time, right?
Aehhh, not quite. There is more to it. Let me get the whiteboard...

Balancing sodium batteries seems like an easy task, but there is far more to consider. As a verdict, I would also recommend a top balancing and have the balancer only running when the battery is fully charged to maintain this created top balancing. Running the balancer all the time, is not a good idea...

JK-BMS with active balancer, all sizes, old style, new style... still the King!👑 All info and prices:
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GEB Sodium 18650 and prismatic Sodium-ion cells (scroll all the way down on the following website):
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