I have 2015 Nissan Leaf which I think has 24KWh battery. But when I charge the ChargePoint app says it took about 18KWh to go from 10%-100% charge (this is the battery % from the car). Which means that 18KWh for 90% charge and hence the 100% charge is only 20KWh? Where is the rest 4KWh. Is that...