According to British i3 owners who have spoken to BMW engineers, cell balancing occurs extremely slowly due to the high resistance resistors used to discharge high charge level cells. They have written that a severely imbalanced battery pack could take weeks to rebalance completely. If true, and if the charge levels of the cells in your battery pack vary significantly, 2 days of cell balancing might be inconsequential.sogorman wrote:I am sure the cells are not imbalanced, I have had the car at fully charged connected to a L2 for two days before running the first test in my google doc.
I wish we had a way to measure charge level imbalance so that we could determine whether cell balancing were required.
sogorman wrote:Yes the car will attempt to cool and regulate the HV pack temperature when plugged into L2 even at 100% SOC./quote]
Was this with battery pack preconditioning enabled? I know that this would result in active cooling occurring if the battery pack temperature were sufficiently high. If cooling could occur whenever an EVSE is plugged in but not actively charging, why would the preconditioning functionality be needed?