Thanks for the info.1) The battery is always balancing itself. But.. the calibration of the range meter may be off after 30k miles. You can get it to recalibrate by draining the battery down close to zero.
2) Supercharging is more damaging to the battery than even high-amperage home charging. It takes a lot of Supercharging to hurt the battery, but if that's the only way you're charging it would be a problem for the battery pack's health. If you can charge at home, that's recommended for battery health, your own convenience, and not taking up a Supercharger stall that somebody driving a long distance could use. Outside of California that last point isn't a big problem, but as Teslas become more common it will be.
3) Not mentioned in your post, but constantly charging to 100% will also damage the battery. Tesla recommends 90% for day-to-day driving, though I set my S at 60-70% when I know I'm not going to need all that range.
1) The battery is always balancing itself. But.. the calibration of the range meter may be off after 30k miles. You can get it to recalibrate by draining the battery down close to zero.
The main negative thing that can happen with this is the artificial shutdown behavior. The car will trigger a shutdown based on a cell voltage dropping below a certain point. But displayed charge level, in either % or rated miles, is based on the overall average readings of all of the cells. So there have been cases where people get pretty far out of balance and didn't know it, and then they get down to 3 or 4 rated miles left, and the car says, "I'm done--shutting down now", because one of the cells dropped too low while most still had a little energy left. So that's why it's a little risky for people to assume it's always going to be perfectly accurate down to that last 1 or 2 left on the display.That being said, what is the negative impact of having the battery pack out of balance? The only thing I can think of is obviously not having a consistent voltage across all of the batteries such that some batteries end up charging to a higher voltage.