It takes 24 hours to fix 1mv of cell imbalance. If you have a friendly local Tesla ranger who will connect your car to toolbox and find out, or someone with a ScanMyTesla setup... you could know how imbalanced you are. With a 10% drop, you could easily be out of balance by 50mv. Your car needs to spend as much time as possible with the Battery SOC >85% and the car asleep. If you're in balance range for 10 hours a day, it could take you over 108 days to get to 5mv charge imbalance level.
Am I the only one whom this strikes as bad design? If you have to let the battery sit at 90% for 1080 hours, aren't you losing more to degradation than you gain through rebalancing?
Is there any good reason to design it that slow? I cannot think of one.
Is there any verifiable source for the rebalancing rate?