About one year ago I purchase and set up about 13.5kWh useable Bolt EV batteries that where new from batteryhookup. For this year I have operated without a BMS. I actually have two batteries technically in parallel a 14S2P setup. My new Chevy Bolt EV battery modules(for my home power system) after about 1 year of near constant use mostly in the range of 3.357V to 4.071V (47V to 57V). I have found that even to this day at the lower range of the voltage I only see about ~.03V variance with no BMS. I don't know for sure but I am pretty sure that is well below a BMS or balancer to actual do any balancing. What is more impressive that many of the cells have nearly or exactly the same numbers in example today most of the pack was either 3.428V or 3.351V. I don't know if anyone else has experience with new extremely high quality batteries but is this typical behavior or perhaps something to do with how high spec the battery is? I have BMS to install on the batteries and while I know they offer extra protection and such I find this hard to believe it has managed to stay this balanced without any actual balancing based upon others experience with other batteries. Anyway Just my observations. I figure someone might find this information useful.