I'm not convinced there's a obvious reason for how long the balance takes.
Except when due to the problem BMS it's way out of balance and goes for 10 hours.
My car has always been ok & balanced every charge etc, yet it seems to be pretty random how long it balances for - always not ages just a few hours.
I guess it's all chemistry so nothing definitive in how evenly the battery cells discharge, different days after the same journey they'll be very slight differences in cell voltage balances. We are only talking a handful of milli-volts but it can be enough to be a couple of hours difference in balancing time.
If your battery is already at a well balanced state, I don't think it's really necessary to let it do a full balance after every charge. The difference in voltage/SoC/range isn't much if it's at a reasonably balanced state.
It's quite possible that the subsequent discharge following a charge, could end up balancing the cells a bit more; so why waste the electricity/pennies that it takes to do a balance every charge...
That said when I can do a scheduled 7kwh charge soon, I'll prob effectively just set the start time to when my off-peak rate starts and then let it go as long as it likes and balance!
Thanks for the feedback @JodyS21 .
Still under travel restrictions in Wales, so usage is still very low.
Did a charge / balance from about 60 miles of remaining milage on the GOM last night on "Off-Peak" rate.
Plugged in and just let it charge, not sure what time it completed, but it did balance okay because the car had ended the charge on the wall box.
This morning I booted up the car ( foot off the brake ) etc.
The voltage was flickering between 250 volts and 249 volts, it finally settled at a steady 249 volts.
Both trips had been reset and the predicted range on the GOM was 161 miles.
I have witnessed the same figures reported on a couple of occasions now after a full charge / balance.
I totally agree with you, there does not appear to be much point in charging my car to 100% and balancing every single time at the moment, when I do not need ALL this range for just small trips.
I some how feel I am trying to balance a battery, that is not that far out of balance in the first place, given the voltage / range figures it is returning at the moment.
My car never received any of the "Buggy" software updates anyway.
