I believe you’re correct. It’s my understanding that there are two methods in which the battery takes in a charge current. The charge port on the BMS charges via the balance connectors, where the regen current comes from the ESC, which comes into the main battery connection (I believe this comes in as an unbalanced “quick charge”). I could be incorrect though, most of my experience in this involves building large lipo packs.
I’d be curious how the combined charge/discharge BMS variants handle the charge current input from a charger vs regen. I can’t imagine it tries to balance charge the regen current? And I would think the combined variant would be more complex and therefore be more expensive, but they seem to be about the same price. I’m by no means a DC power systems expert, anyone care to chime in? @chaka ?