I'm not worried about the 79.6 Nominal Full pack, I have only 230 km so I have to use it a bit to wake it up with some charge cycles, I'm only a bit concerned about the reading on SMT regarding the Hystory charging.8mV isnt that much and it wouldnt be the reason to low nominal full pack.
If we play with the math, and one lone cell is 8mV higher in SOC than all other, the pack would loose the storage for 8mV on all other cells, thats about 0.8%, or about 0.65kwh....if all other cells was 8mV lower than the highest. Irl the average probably is in the middle and thus some 0.3kWh.
Also, as we are carefull not to live the battery for long at 100% SOC, we anyhow will have some imbalance, and accounting for this, we probably dont have more loss than 0.3kwh I guess.
They say balancing only happens if SOC is 90% or more. I dont know the setup of the balancing resistors, if the the battery connector open these circuits. I know I did read that Model S and X had balaning resistors with much lower resistanse, causing higher balancing current and shorter balancing time( but more drain).
I guess you only need to ”wake the battery ” and learn the BMS as we said, some cycles, not too shallow, and at least one charge to 90% with time for balaning afterwards and if you dare, one completely full charge.
Otherwise, just use it as you will and it most probable will be good anyway. (Remember, whats good for the BMS and the readings isnt necessarily best for the battery).
I see mostly 4mV at 70-80% but If I charge to 90 it probably is more in the beginning and after some hours rest I have seen 4mV at 90 also. My full charge did say 10mV imbalance, but I drove away asap after reaching 100%.
It seems they charged in Freemont or in USA in DC about 53 kWh (I can estimate to 100%) and then the car lost in stationary way the charge to about 40% during the two month of trip to Europe .The car was at about 40% when I had the delivery.