I don't know for sure, but I'd guess balancing only happens at 100%
In the mid range (5-95%) it's very hard to detect cell imbalance. Because of the charge curve of the chemistry it's much easier near zero or full.. The pack would have to be pretty unbalanced to see anything at 80%. I wonder if the car would ever go to 100% even if told to do 80% for a long time...
5 minutes low current on and 45min off sounds about right.. I would assume when any cell hits 4.15 or 4.2V during charge, then charge stops and resistive balancing drains the high cells down to 4.10v.. At probably 1/10th the charge speed.. Otherwise the resistive elements would generate too much heat. If after this cycle some cells are still 4.10v then the cycle repeats.. More charge till some guys get too full then discharge them down to 4.1v
Someday we'll be able to see the individual cell voltages then we'll know for sure.
So 2 cycles (45+5min) is the most anyone has seen?
How many people have these data loggers on their EVSE units?
'17 blue Volt Premier w/ACC
'12 SL black Leaf
'11 SL blue Leaf
Gen1 & Gen2 EV1 1997-2003
PV 2.4Kw, 10kWh lithium battery SCE TOU-DA