Being somewhat new to the ebike battery arena, I'm still surprised that most batteries don't come with a detailed note about the specific BMS in each pack. You know...kind of a data sheet showing the exact functions of the onboard BMS. There is a thread on the forum here where it did show a BMS that you can purchase for your own build, and it did show great detail on the capability of that BMS. I realize there are some generalities in many/most BMS units, like overcharge and short protection. However, it would be good to know if there is a functional balance component in the BMS and how it functions to achieve balance. Maybe I'm overthinking it, but I believe this would be helpful for those of us who want to know information like this as it would provide better knowledge for our charging habits and maybe better selection of aftermarket chargers. One may not need a manual the size of "War and Peace", but a little detail might be helpful.
A poster on another site mentioned that you can probably know if you have a balance capable BMS in your pack if you have a charger that has a display for charging amps. I have the Luna Advanced Charger that has volts and amps on the display. It also has that capability of charging at 80-90-100 percent selection along with an amp selection. I was told that charging at 100%, you could keep tabs on the amp display, and if the amperage dropped and fluctuated to some degree as max voltage was reached, you could pretty well count on the BMS having a balance funtion. I notice when I charge at my more common 80% level, the amperage never changes all the way to full 80% charge when the charger turns off. If I understand correctly, the balance function only operates at 100% charge, and the amp drop and fluctuation one sees on an amp display indicates a balance function in operation. So I guess I can assume my pack is balancing due to that observation. I'm learning here, not teaching...LOL!