So, if there is a voltage difference between the cells it means that some off the groups have less capacity then the others.
When you are charging the whole packs, the groups with less capacity will faster hit the max voltage.
The current you will go charging will be bigger then the current the balance board can handel to correct the voltage from each cell.
So you will slowly overcharge some cells.
A balance circuit in the bms will charge until one off those cells are at 4.2v when one off the cells hit that voltage, the bms will start to discharge the cell to the higest voltage from one off the other cells.
Repeating this entire progress over time reduces the difference between the cell voltage.
But I think that when you place the balance plug from the balancer parallel over the balance plug from the bms. And you charge your cells through the BMS. You will be fine.
Due this you can boost up the balance capabilities
This is basically the same thing as a charge-only BMS, except without the safety features that would cut off charging.
So if your charger messed up and went too high, this would not stop it from lighting the battery on fire.
Iāve also eyeballed these and thought about it, but never used them. I think a small charge-only BMS is much better as it gives you redundant safety features (in the charger and in the battery). That way if your charger failed [in a certain way] it wouldnāt be an automatic fire.
And if you wire your ESC around the BMS straight to the battery in a standard esk8 ābypassedā configuration, your ESC could still overcharge (like on a long hill braking on full charge) without cutting off brakes, but the charge port canāt overcharge.
itās the same company which sell the Balance Board . Unfortunately the information I fount on Ali are a bit rare and some donāt make sense for me. Like you can set balance current from 0-200mA but may 400mAā¦what does it mean? Same with discharge, can set from 40-80A but may 255A. Hold us up to date how things are going !
As i said there is no cut off protection, but there people running no bms at all as well, so that is definitely a way up the game, plusā¦I think you said all by your own in your comment before:
The other thing is that shit can happen with a bms as well. What about the cases where the d140 didnāt balance the first cell group and fucked up not only one pack with it.
What i donāt like in the usual bms as well as in this balance board is that you just donāt see the actual individual cell pack voltage. If there is a bigger drift in one group you will only see it with a smart bms or if you measure your pack with a multimeter from time to time oooor when itās anyway too late and your bms cut off or you lose power due to one p group being totally off.
Yes, please, start one, Iād be highly interested in what others think as I canāt fit a regular charge only in my board, but this one might fit on top of the cells.
itās the same company which sell the Balance Board 
. Unfortunately the information I fount on Ali are a bit rare and some donāt make sense for me. Like you can set balance current from 0-200mA but may 400mAā¦what does it mean? Same with discharge, can set from 40-80A but may 255A. Hold us up to date how things are going !
