Here is what I have learned from my research:
6831 cells - 69 parallel/99 series
18650/2,2Ah Li-ion cells (18 mm in diameter and 650 mm long)
450 kg/992 lb
...The pack operates at a nominal 375 volts, stores about 53 kilowatt hours of electric energy...
Well we know the roadster uses 2.2mah cells, and we know that there are 6831 of them. The rest is easy to figure out....ESS: 53kWh or 56kWh
(An earlier version of that document had said 56kwh then they edited/changed it to say 53...)
Absolutely. Both answers could be correct. It doesn't really matter unless you compare the roadster pack to a different EV using different criteria for calculating numbers.It might depend on what nominal voltage they use to calculate. 3.7V gets close to 56 kwh, 3.6V is around 54 kwh.
Maybe, but in the end, who cares? As long as like comparisons are being made when comparing different packs, all will be well.Different chemistries have different nominal voltages, and different cells within the same chemistry can have more or less sag under the same current draw, which would also change nominal voltage and kwh's delivered. Tesla may have assumed 3.7V nominal at first and then seen more voltage sag than expected and recalculated with 3.6V.